Although I've received a couple of reports about this 'bug' (?) I was never able to reproduce it here. And if I can't reproduce it I can't fix it. Even worst, it seems to be a sporadic kind of bug, i.e.; it doesn't always happen, which makes it the programmer's worst nightmare.
For anybody having this problem in any kind of consistent way, please post here any NextSTART settings you might think relevant (theme being used, menu animations on or off, OS version, system language, etc...). Please also experiment to see if changing themes, or some NextSTART settings, make the error go away.