X session crashes when switching workspace and video playing

I got something very similar, but for me it only crashes when I have the window with the video is between the workspaces (note I got the effect that makes workspace switching smooth, so a window between the workspaces can be seen from both)

I got a ATI Radeon 9800 graphics card. I also have not installed it's closed driver.

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add your ~/.xsession-errors, /var/log/Xorg.0.log and the output of lspci -vvnn to your bug report as separate attachments? Thanks in advance.

The problem doesn't occur any more.

I still use Open source driver, but I switched to the 'Emerald Theme Manager' (green diamond icon). And not the default Ubuntu effects. I've got idea if this is the reason it's working fine now.

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!