diff --git a/autoload/vimspector/internal/channel.vim b/autoload/vimspector/internal/channel.vim
index b05d8e8..b44436b 100644
--- a/autoload/vimspector/internal/channel.vim
+++ b/autoload/vimspector/internal/channel.vim
@@ -62,7 +62,7 @@ function! vimspector#internal#channel#StartDebugSession( config ) abort
           \              )
   endif
 
-  let l:addr = get( a:config, 'host', 'localhost' ) . ':' . a:config[ 'port' ]
+  let l:addr = get( a:config, 'host', '127.0.0.1' ) . ':' . a:config[ 'port' ]
 
   echo 'Connecting to ' . l:addr . '... (waiting fo up to 10 seconds)'
   let s:ch = ch_open( l:addr,
diff --git a/autoload/vimspector/internal/neochannel.vim b/autoload/vimspector/internal/neochannel.vim
index 5414568..f20684d 100644
--- a/autoload/vimspector/internal/neochannel.vim
+++ b/autoload/vimspector/internal/neochannel.vim
@@ -66,7 +66,7 @@ function! vimspector#internal#neochannel#StartDebugSession( config ) abort
     endtry
   endif
 
-  let l:addr = get( a:config, 'host', 'localhost' ) . ':' . a:config[ 'port' ]
+  let l:addr = get( a:config, 'host', '127.0.0.1' ) . ':' . a:config[ 'port' ]
 
   let attempt = 1
   while attempt <= 10
diff --git a/docs/schema/vimspector.schema.json b/docs/schema/vimspector.schema.json
index 97fea75..cd79f11 100644
--- a/docs/schema/vimspector.schema.json
+++ b/docs/schema/vimspector.schema.json
@@ -200,7 +200,7 @@
           "properties": {
             "host": {
               "type": "string",
-              "default": "localhost",
+              "default": "127.0.0.1",
               "description": "Connect to this host in multi-session mode"
             },
             "port": {
diff --git a/python3/vimspector/installer.py b/python3/vimspector/installer.py
index f27f46e..f0f85a4 100644
--- a/python3/vimspector/installer.py
+++ b/python3/vimspector/installer.py
@@ -344,11 +344,12 @@ def WriteAdapters( all_adapters, to_file=None ):
 
 
 def InstallGeneric( name, root, gadget ):
-  extension = os.path.join( root, 'extension' )
+  extension_path = gadget.get( 'extension_path', 'extension' )
+  extension = os.path.join( root, extension_path )
   for f in gadget.get( 'make_executable', [] ):
     MakeExecutable( os.path.join( extension, f ) )
 
-  MakeExtensionSymlink( name, root )
+  MakeExtensionSymlink( name, root, extension_path )
 
 
 def InstallCppTools( name, root, gadget ):
@@ -703,8 +704,8 @@ def ExtractZipTo( file_path, destination, format ):
         CheckCall( [ 'tar', 'zxvf', file_path ] )
 
 
-def MakeExtensionSymlink( name, root ):
-  MakeSymlink( name, os.path.join( root, 'extension' ) ),
+def MakeExtensionSymlink( name, root, extension_path = 'extension' ):
+  MakeSymlink( name, os.path.join( root, extension_path ) ),
 
 
 def MakeSymlink( link, pointing_to, in_folder = None ):
diff --git a/python3/vimspector/stack_trace.py b/python3/vimspector/stack_trace.py
index df650b9..f38e4ba 100644
--- a/python3/vimspector/stack_trace.py
+++ b/python3/vimspector/stack_trace.py
@@ -188,11 +188,12 @@ class StackTraceView( object ):
       return
 
     def consume_threads( message ):
+      requesting = False
       if self._requesting_threads == StackTraceView.ThreadRequestState.PENDING:
         # We may have hit a thread event, so try again.
         self._requesting_threads = StackTraceView.ThreadRequestState.NO
         self.LoadThreads( *self._pending_thread_request )
-        return
+        requesting = True
 
       self._requesting_threads = StackTraceView.ThreadRequestState.NO
       self._pending_thread_request = None
@@ -211,8 +212,6 @@ class StackTraceView( object ):
         stoppedThreadId = stopEvent.get( 'threadId' )
         allThreadsStopped = stopEvent.get( 'allThreadsStopped', False )
 
-      requesting = False
-
       # FIXME: This is horribly inefficient
       for t in message[ 'body' ][ 'threads' ]:
         thread = None
@@ -240,7 +239,10 @@ class StackTraceView( object ):
         # If this is a stopped event, load the stack trace for the "current"
         # thread. Don't do this on other thrads requests because some servers
         # just break when that happens.
-        if infer_current_frame:
+        #
+        # Don't do this if we're also satisfying a cached request already (we'll
+        # do it then)
+        if infer_current_frame and not requesting:
           if thread.id == self._current_thread:
             if thread.CanExpand():
               self._LoadStackTrace( thread, True, reason )
diff --git a/support/test/kotlin/.gitignore b/support/test/kotlin/.gitignore
new file mode 100644
index 0000000..f8b92c3
--- /dev/null
+++ b/support/test/kotlin/.gitignore
@@ -0,0 +1,2 @@
+.gradle
+build
diff --git a/support/test/kotlin/.vimspector.json b/support/test/kotlin/.vimspector.json
new file mode 100644
index 0000000..d2c2a63
--- /dev/null
+++ b/support/test/kotlin/.vimspector.json
@@ -0,0 +1,21 @@
+{
+  "configurations": {
+    "kotlin-debug-adapter launch": {
+      "adapter": "cust_kotlin-debug-adapter",
+      "configuration": {
+        "request": "launch",
+        "projectRoot": "${workspaceFolder}",
+        "mainClass": "vimspector/test/ApplicationKt"
+      }
+    },
+    "kotlin-debug-adapter attach": {
+      "adapter": "cust_kotlin-debug-adapter",
+      "configuration": {
+        "request": "attach",
+        "projectRoot": "${workspaceFolder}",
+        "hostName": "${hostName}",
+        "port": "${port}"
+      }
+    }
+  }
+}
diff --git a/support/test/kotlin/build.gradle.kts b/support/test/kotlin/build.gradle.kts
new file mode 100644
index 0000000..e93c004
--- /dev/null
+++ b/support/test/kotlin/build.gradle.kts
@@ -0,0 +1,25 @@
+plugins {
+    kotlin("jvm") version "1.4.0"
+
+    application
+}
+
+repositories {
+    // Use jcenter for resolving dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+dependencies {
+    // Align versions of all Kotlin components
+    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))
+
+    // Use the Kotlin JDK 8 standard library.
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+}
+
+application {
+    // Define the main class for the application.
+    mainClassName = "vimspector.test.ApplicationKt"
+}
+
diff --git a/support/test/kotlin/settings.gradle.kts b/support/test/kotlin/settings.gradle.kts
new file mode 100644
index 0000000..8cbc5be
--- /dev/null
+++ b/support/test/kotlin/settings.gradle.kts
@@ -0,0 +1 @@
+rootProject.name = "vimspector-test"
diff --git a/support/test/kotlin/src/main/kotlin/vimspector/test/Application.kt b/support/test/kotlin/src/main/kotlin/vimspector/test/Application.kt
new file mode 100644
index 0000000..99655da
--- /dev/null
+++ b/support/test/kotlin/src/main/kotlin/vimspector/test/Application.kt
@@ -0,0 +1,5 @@
+package vimspector.test
+
+fun main(args: Array<String>) {
+    println("Hello World!")
+}
diff --git a/support/test/tcl/test b/support/test/tcl/test
index e77a486..a77f56f 100644
--- a/support/test/tcl/test
+++ b/support/test/tcl/test
@@ -3,6 +3,8 @@
 set SCALAR g
 array set ARRAY {key1 value1 key2 value2}
 
+set LIST [list a b c {def} {g h i j} k l m]
+
 proc Wrap { body } {
   uplevel 1 $body
 }