My girlfriend just had something very strange happen on her macbook (core2duo 2.16) that I've never seen before. Basically the letter B became distorted in several applications - firefox, Mail and preview. Restarting the apps didn't solve it, but logging out did. For now at least. It is visible when I took a screen grab, indicating that it's hardware, but still very strange. Are there any viruses for mac that could do this? I've used macs since 1992 and never seenanything like this.. Any ideas? Thanks!