I had this problem with EQ2Map, too - and thought it programme specific. Apparently, however, taskbar icon corruption has been a problem for Windows 7 since beta and the issue carried through to launch.
The stuff I found on it before suggests it is something to do with the icon cache and various fixes are suggested for it.
It's been reported as random, though I wonder if it is more likely for some programs, depending on how they update/interact with Windows etc?
I dunno, other than to say that I am pretty certain that it doesn't appear to be an EQ2Map-specific problem (Google: corrupt taskbar icons windows 7).
Ker
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