demo.castlabs.net hits a pile of asserts in debug mode.

When visiting http://demo.castlabs.net , the renderer will assert when moving the mouse after loading the page (probably due to problems with the stream that is loaded by default).

The browser will handle this first assert gracefully and start another renderer, which does not assert and is able to play the video. When selecting another video (e.g. "Tears of Steel") and then selecting the default video again though, the renderer asserts again, and then the browser also asserts.

Stack traces attached.

Release mode is not affected at all.