Created attachment 159731 [details]
Screenshot of quadrapassel

When trying to start Quadrapassel from the command line, it starts but I get the following message:

(quadrapassel:2206): ClutterGLX-CRITICAL **: Unable to make the stage window 0x2000040 the current GLX drawable

(quadrapassel:2206): ClutterGLX-CRITICAL **: Unable to make the stage window 0x200005d the current GLX drawable

When I start a new game the elements are not rendered properly but the game is responsive and playable, as opposed to the situation from 2 days ago when the key presses were not very responsive.

One of the explanations for the possible cause of this problem is that Quadrapassel is a "multi-stage" Clutter application as opposed to Lights Off and Nibbles which are not "multi-stage" Clutter applications . And that it seams that "multi-stage" Clutter is not supported by all graphic card drivers.

I use Intel gma950 graphic card
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)

On my computer Lights Off and Nibbles run perfectly normal.

I'm also sending a screenshot of Quadrapassel in order to make more clear the bad rendering problem.

I tried running Quadrapassel both with Compiz and Metacity, but it behaves completely the same.

Also quitting Quadrapassel produces the following messages in the console I started it from:

quadrapassel:2206): GLib-GObject-WARNING **: invalid uninstantiatable type `<invalid>' in cast to `ClutterActor'
(quadrapassel:2206): Clutter-CRITICAL **: clutter_actor_destroy: assertion `CLUTTER_IS_ACTOR (self)' failed
(quadrapassel:2206): GLib-GObject-WARNING **: invalid unclassed pointer in cast to `ClutterActor'
(quadrapassel:2206): Clutter-CRITICAL **: clutter_actor_destroy: assertion `CLUTTER_IS_ACTOR (self)' failed
(quadrapassel:2206): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `ClutterActor'
(quadrapassel:2206): Clutter-CRITICAL **: clutter_actor_destroy: assertion `CLUTTER_IS_ACTOR (self)' failed
(quadrapassel:2206): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `ClutterActor'