I don't know if this is a virus, or a bug, or the heat (but my money's on a virus). It's happened twice now, so the red flags are going up in my head. I'll be working along, and suddenly when I use the menu at the top of the screen for any application, there will be letters missing. For example, "File" becomes "Fil", "View" becomes "Vi w", and so forth. Seems random, but there will be odd consistencies - like most of the e's and m's (but not all) are gone, for example. A restart fixes it temporarily. Anybody know what this is? I've got an external HD attached to this monkey, and I'm contemplating whether or not to quarantine it from my home machine because of this. TIA john a.