diff --git a/lib/ace/layer/marker.js b/lib/ace/layer/marker.js
index ee83cf5d..7470bfd7 100644
--- a/lib/ace/layer/marker.js
+++ b/lib/ace/layer/marker.js
@@ -95,7 +95,7 @@ var Marker = function(parentEl) {
             }
             else {
                 this.drawSingleLineMarker(
-                    html, range, marker.clazz + " start", config,
+                    html, range, marker.clazz + " ace_start", config,
                     null, marker.type
                 );
             }
@@ -116,7 +116,7 @@ var Marker = function(parentEl) {
             row, range.start.column,
             row, this.session.getScreenLastRowColumn(row)
         );
-        this.drawSingleLineMarker(stringBuilder, lineRange, clazz + " start", layerConfig, 1, "text");
+        this.drawSingleLineMarker(stringBuilder, lineRange, clazz + " ace_start", layerConfig, 1, "text");
 
         // selection end
         row = range.end.row;
@@ -140,7 +140,7 @@ var Marker = function(parentEl) {
         var left = Math.round(padding + range.start.column * config.characterWidth);
 
         stringBuilder.push(
-            "<div class='", clazz, " start' style='",
+            "<div class='", clazz, " ace_start' style='",
             "height:", height, "px;",
             "right:0;",
             "top:", top, "px;",
diff --git a/lib/ace/theme/clouds.css b/lib/ace/theme/clouds.css
index 6877cfd1..7c0625bf 100644
--- a/lib/ace/theme/clouds.css
+++ b/lib/ace/theme/clouds.css
@@ -37,7 +37,7 @@
   background: #BDD5FC
 }
 
-.ace-clouds.ace_multiselect .ace_selection.start {
+.ace-clouds.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #FFFFFF;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/clouds_midnight.css b/lib/ace/theme/clouds_midnight.css
index 4e9fa38b..759dfafd 100644
--- a/lib/ace/theme/clouds_midnight.css
+++ b/lib/ace/theme/clouds_midnight.css
@@ -37,7 +37,7 @@
   background: #000000
 }
 
-.ace-clouds-midnight.ace_multiselect .ace_selection.start {
+.ace-clouds-midnight.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #191919;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/cobalt.css b/lib/ace/theme/cobalt.css
index 8c15197c..befa102e 100644
--- a/lib/ace/theme/cobalt.css
+++ b/lib/ace/theme/cobalt.css
@@ -37,7 +37,7 @@
   background: rgba(179, 101, 57, 0.75)
 }
 
-.ace-cobalt.ace_multiselect .ace_selection.start {
+.ace-cobalt.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #002240;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/dawn.css b/lib/ace/theme/dawn.css
index 9adf5960..03948d89 100644
--- a/lib/ace/theme/dawn.css
+++ b/lib/ace/theme/dawn.css
@@ -37,7 +37,7 @@
   background: rgba(39, 95, 255, 0.30)
 }
 
-.ace-dawn.ace_multiselect .ace_selection.start {
+.ace-dawn.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #F9F9F9;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/github.css b/lib/ace/theme/github.css
index 3ff665d6..1b8f282e 100644
--- a/lib/ace/theme/github.css
+++ b/lib/ace/theme/github.css
@@ -94,7 +94,7 @@
 .ace-github .ace_marker-layer .ace_selection {
   background: rgb(181, 213, 255);
 }
-.ace-github.ace_multiselect .ace_selection.start {
+.ace-github.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px white;
   border-radius: 2px;
 }
diff --git a/lib/ace/theme/idle_fingers.css b/lib/ace/theme/idle_fingers.css
index e07d20ad..5dda0eee 100644
--- a/lib/ace/theme/idle_fingers.css
+++ b/lib/ace/theme/idle_fingers.css
@@ -37,7 +37,7 @@
   background: rgba(90, 100, 126, 0.88)
 }
 
-.ace-idle-fingers.ace_multiselect .ace_selection.start {
+.ace-idle-fingers.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #323232;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/kr_theme.css b/lib/ace/theme/kr_theme.css
index 37dec825..2b982338 100644
--- a/lib/ace/theme/kr_theme.css
+++ b/lib/ace/theme/kr_theme.css
@@ -37,7 +37,7 @@
   background: rgba(170, 0, 255, 0.45)
 }
 
-.ace-kr-theme.ace_multiselect .ace_selection.start {
+.ace-kr-theme.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #0B0A09;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/merbivore.css b/lib/ace/theme/merbivore.css
index e5732f78..19fb66fc 100644
--- a/lib/ace/theme/merbivore.css
+++ b/lib/ace/theme/merbivore.css
@@ -37,7 +37,7 @@
   background: #454545
 }
 
-.ace-merbivore.ace_multiselect .ace_selection.start {
+.ace-merbivore.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #161616;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/merbivore_soft.css b/lib/ace/theme/merbivore_soft.css
index 333348fc..7fc6e567 100644
--- a/lib/ace/theme/merbivore_soft.css
+++ b/lib/ace/theme/merbivore_soft.css
@@ -37,7 +37,7 @@
   background: #494949
 }
 
-.ace-merbivore-soft.ace_multiselect .ace_selection.start {
+.ace-merbivore-soft.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #1C1C1C;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/mono_industrial.css b/lib/ace/theme/mono_industrial.css
index 9f56cdf8..c22a2064 100644
--- a/lib/ace/theme/mono_industrial.css
+++ b/lib/ace/theme/mono_industrial.css
@@ -37,7 +37,7 @@
   background: rgba(145, 153, 148, 0.40)
 }
 
-.ace-mono-industrial.ace_multiselect .ace_selection.start {
+.ace-mono-industrial.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #222C28;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/monokai.css b/lib/ace/theme/monokai.css
index 7f0de488..f4d5a731 100644
--- a/lib/ace/theme/monokai.css
+++ b/lib/ace/theme/monokai.css
@@ -37,7 +37,7 @@
   background: #49483E
 }
 
-.ace-monokai.ace_multiselect .ace_selection.start {
+.ace-monokai.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #272822;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/pastel_on_dark.css b/lib/ace/theme/pastel_on_dark.css
index cbf3f43f..5dea23f4 100644
--- a/lib/ace/theme/pastel_on_dark.css
+++ b/lib/ace/theme/pastel_on_dark.css
@@ -37,7 +37,7 @@
   background: rgba(221, 240, 255, 0.20)
 }
 
-.ace-pastel-on-dark.ace_multiselect .ace_selection.start {
+.ace-pastel-on-dark.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #2C2828;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/solarized_dark.css b/lib/ace/theme/solarized_dark.css
index f870db7d..62834ee4 100644
--- a/lib/ace/theme/solarized_dark.css
+++ b/lib/ace/theme/solarized_dark.css
@@ -40,7 +40,7 @@
   background: rgba(255, 255, 255, 0.1)
 }
 
-.ace-solarized-dark.ace_multiselect .ace_selection.start {
+.ace-solarized-dark.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #002B36;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/solarized_light.css b/lib/ace/theme/solarized_light.css
index 3dd8098d..0d0b76a6 100644
--- a/lib/ace/theme/solarized_light.css
+++ b/lib/ace/theme/solarized_light.css
@@ -37,7 +37,7 @@
   background: #073642
 }
 
-.ace-solarized-light.ace_multiselect .ace_selection.start {
+.ace-solarized-light.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #FDF6E3;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/textmate.css b/lib/ace/theme/textmate.css
index eca40750..390412b2 100644
--- a/lib/ace/theme/textmate.css
+++ b/lib/ace/theme/textmate.css
@@ -132,7 +132,7 @@
 .ace-tm .ace_marker-layer .ace_selection {
   background: rgb(181, 213, 255);
 }
-.ace-tm.ace_multiselect .ace_selection.start {
+.ace-tm.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px white;
   border-radius: 2px;
 }
diff --git a/lib/ace/theme/tomorrow.css b/lib/ace/theme/tomorrow.css
index fb95693b..86541e02 100644
--- a/lib/ace/theme/tomorrow.css
+++ b/lib/ace/theme/tomorrow.css
@@ -37,7 +37,7 @@
   background: #D6D6D6
 }
 
-.ace-tomorrow.ace_multiselect .ace_selection.start {
+.ace-tomorrow.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #FFFFFF;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/tomorrow_night.css b/lib/ace/theme/tomorrow_night.css
index f044a623..c4a7b7c3 100644
--- a/lib/ace/theme/tomorrow_night.css
+++ b/lib/ace/theme/tomorrow_night.css
@@ -37,7 +37,7 @@
   background: #373B41
 }
 
-.ace-tomorrow-night.ace_multiselect .ace_selection.start {
+.ace-tomorrow-night.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #1D1F21;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/tomorrow_night_blue.css b/lib/ace/theme/tomorrow_night_blue.css
index 975646ec..cb5ac180 100644
--- a/lib/ace/theme/tomorrow_night_blue.css
+++ b/lib/ace/theme/tomorrow_night_blue.css
@@ -38,7 +38,7 @@
   background: #003F8E
 }
 
-.ace-tomorrow-night-blue.ace_multiselect .ace_selection.start {
+.ace-tomorrow-night-blue.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #002451;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/tomorrow_night_bright.css b/lib/ace/theme/tomorrow_night_bright.css
index 56e915f1..4a7169f2 100644
--- a/lib/ace/theme/tomorrow_night_bright.css
+++ b/lib/ace/theme/tomorrow_night_bright.css
@@ -37,7 +37,7 @@
   background: #424242
 }
 
-.ace-tomorrow-night-bright.ace_multiselect .ace_selection.start {
+.ace-tomorrow-night-bright.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #000000;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/tomorrow_night_eighties.css b/lib/ace/theme/tomorrow_night_eighties.css
index 6e040685..6134cff2 100644
--- a/lib/ace/theme/tomorrow_night_eighties.css
+++ b/lib/ace/theme/tomorrow_night_eighties.css
@@ -38,7 +38,7 @@
   background: #515151
 }
 
-.ace-tomorrow-night-eighties.ace_multiselect .ace_selection.start {
+.ace-tomorrow-night-eighties.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #2D2D2D;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/twilight.css b/lib/ace/theme/twilight.css
index 86a0f95b..58382276 100644
--- a/lib/ace/theme/twilight.css
+++ b/lib/ace/theme/twilight.css
@@ -37,7 +37,7 @@
   background: rgba(221, 240, 255, 0.20)
 }
 
-.ace-twilight.ace_multiselect .ace_selection.start {
+.ace-twilight.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #141414;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/vibrant_ink.css b/lib/ace/theme/vibrant_ink.css
index f4eafc0b..578f6ae7 100644
--- a/lib/ace/theme/vibrant_ink.css
+++ b/lib/ace/theme/vibrant_ink.css
@@ -37,7 +37,7 @@
   background: #6699CC
 }
 
-.ace-vibrant-ink.ace_multiselect .ace_selection.start {
+.ace-vibrant-ink.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #0F0F0F;
   border-radius: 2px
 }
diff --git a/lib/ace/theme/xcode.css b/lib/ace/theme/xcode.css
index 86d141e3..3605d01e 100644
--- a/lib/ace/theme/xcode.css
+++ b/lib/ace/theme/xcode.css
@@ -38,7 +38,7 @@
   background: #B5D5FF
 }
 
-.ace-xcode.ace_multiselect .ace_selection.start {
+.ace-xcode.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px #FFFFFF;
   border-radius: 2px
 }
diff --git a/tool/Theme.tmpl.css b/tool/Theme.tmpl.css
index 447c88e1..ebc68c02 100644
--- a/tool/Theme.tmpl.css
+++ b/tool/Theme.tmpl.css
@@ -39,7 +39,7 @@
   background: %selection%;
 }
 
-.%cssClass%.ace_multiselect .ace_selection.start {
+.%cssClass%.ace_multiselect .ace_selection.ace_start {
   box-shadow: 0 0 3px 0px %background%;
   border-radius: 2px;
 }