Occasionally some applications lock and their windows goes dark or changes colour. This has happened most frequently when running Firefox but happened today when running Libre Office Writer and pasting an image. The system monitor shows 100% CPU on these occasions but I am able to kill the appropriate process.
This is most frustrating and does not give me confidence in using Unity especially as I have never had a similar problem running 10.04 Gnome.
Please let me know what detail/log is needed so to provide information so that the problem may be diagnosed/fixed.