I had this problem since i built the system, but it had gone away as soon as i removed Avast, now, 7 months on, i have reinstalled Avast, and have the same problem.
every time i click on something that gets highlighted by the mouse, the tab sticks and will not go away. but it will not constantly happen, only 1 will stick at a time. the only way i can get rid of them is to change resolution and there gone, but only to come back again when i click on something.
every driver is upto date.
specs:
Avast Home Edition
windows Vista ultimate 32 bit
Nvidia 8800 GTX