https://bugs.freedesktop.org/show_bug.cgi?id=35697
--- Comment #25 from Nikos Chantziaras realnc@gmail.com 2011-07-14 13:43:10 PDT --- I just found out that this seems to happen only with the 64-bit Flash plugin, version 10.2.159.1. To reproduce the crash, here's the download for that Flash version:
http://download.macromedia.com/pub/labs/flashplayer10/flashplayer10_2_p3_64b...
The new version of 64-bit Flash (11.0.something) seems to use a different method to display video (a pretty useless method, which tears in fullscreen and is extremely slow, making fullscreen videos unwatchable.)