--- a/src/browser/keyboard.js
+++ b/src/browser/keyboard.js
@@ -270,6 +270,9 @@
         window.addEventListener("input", input_handler, false);
     };
     this.init();
+
+    // Session-boundary hook for browser focus and pointer-lock changes.
+    this.release_all = blur_handler;

     this.simulate_press = function(code)
     {
@@ -343,23 +346,32 @@
     function keyup_handler(e)
     {
-        if(!e.altKey && keys_pressed[0x38])
-        {
-            // trigger ALT keyup manually - some browsers don't
-            // see issue #165
-            handle_code(0x38, false);
-        }
+        release_stale_modifiers(e);
         return handler(e, false);
     }

     function keydown_handler(e)
     {
-        if(!e.altKey && keys_pressed[0x38])
+        release_stale_modifiers(e);
+        return handler(e, true);
+    }
+
+    function release_stale_modifiers(e)
+    {
+        if(!e.shiftKey)
         {
-            // trigger ALT keyup manually - some browsers don't
-            // see issue #165
-            handle_code(0x38, false);
+            if(keys_pressed[0x2A]) handle_code(0x2A, false);
+            if(keys_pressed[0x36]) handle_code(0x36, false);
         }
-        return handler(e, true);
+        if(!e.ctrlKey)
+        {
+            if(keys_pressed[0x1D]) handle_code(0x1D, false);
+            if(keys_pressed[0xE01D]) handle_code(0xE01D, false);
+        }
+        if(!e.altKey)
+        {
+            if(keys_pressed[0x38]) handle_code(0x38, false);
+            if(keys_pressed[0xE038]) handle_code(0xE038, false);
+        }
     }

     function blur_handler(e)