On my last machine and to an even greater extent on my new one I have a strange cursor artifact problem with the compose message box in evolution. (both machines are using a nvidia card and the non-free drivers) an 8800GT and Quadro FX500 respectively.
I think it started to occur when I started using Compiz, on my old machine it only appeared after gnome had been up for some time..on the new one it appears most of the time.
The effect is that copies of (or copies of portions of) the cursor get "stuck" in the message window. This happens most frequently when cutting or pasting text or moving the cursor position with the arrow keys but it can also happen when typing in which case the bottom few pixels of the cursor remain in previous positions within the text..also sometimes when a line wraps a copy of the cursor remains at the end. Moving the window will remove the existing ones, so I was thinking it was a graphics/windowmanager glitch but it only seems to happen in Evolution. It also appears in any screenshots I take as below.
http://digimatic.plus.com/evolution.jpg
Anyone here experienced the same problem ?