Problem with cursor in 3D view
Question:
On some Linux/Unix machines the 3D view is "smeared" with the cursor or the underlying content of the 3D view.
Answer:
To prevent this, try to add the following to your xserver configuration file (e.g xorg.conf or XF86config) in the section Screen:
Option "HWCursor" "true"
Also make sure, that SW_CURSOR is not set.