Comment 1 for bug 390363

Thanks for the bug report and the testing. This is a tough one. This is not a common error, and infact, I have never seen it before. I did some research on the error, and it looks like an issue with your xorg setup, or possibly a video card driver issue.

I have 2 suggestions:

1) try disabling desktop effects (although I doubt that will fix it)
2) look for an updated video card driver (probably not in the repository)

If both of those don't work, you might need to post a bug report with Ubuntu or the Xorg project. I found this same error message being reported on many different video players (such as Mplayer, Xine, VLC, etc...). So, I don't think it's anything unique to OpenShot, ya know.

Gook luck!