The only difference with mine is that the black glitch is only visible briefly as a flicker, and then it corrects itself. I had to be very swift to grab the screenshot above!
I hope this is useful to you. I am not versed in reporting bugs, so if there is any other information I can provide please let me know how I can provide it. Thank you.
I have this problem also. Using Ubuntu 12.04 64 bit, and Nvidia 9800GT. It happens with both proprietary Nvidia driver and Nouveau too. Screenshot http:// img854. imageshack. us/img854/ 8371/screenshot from201204211. jpg
The only difference with mine is that the black glitch is only visible briefly as a flicker, and then it corrects itself. I had to be very swift to grab the screenshot above!
I hope this is useful to you. I am not versed in reporting bugs, so if there is any other information I can provide please let me know how I can provide it. Thank you.