Installed Prevx 18.104.22.168 yesterday. Security seems fine, but screen smearing evident with a couple programs. One is the Windows game Hearts and the other is a menu program called getStarted!XP. Problem is similar to case reported in this archived thread: https://www.wilderssecurity.com/showthread.php?t=256173. With Hearts the cards smear badly and the pixel break up makes the game unplayable. With the menu, the individual program icons are all surrounded by black boxes. The black background behind each icon disappears after passing the mouse across it. My OS is Win XP Pro 32. Downgraded security from Maximum to Medium, but that had no impact. Obviously, prefer not to tamper with security level. Compared to protection benefit, these symptoms are trivial. Nonetheless it's an inconvenience. What do you suggest to eliminate interference.