I can reproduce this error in B4A (Win 7). It happens when you pass over a keyword in B4A but B4A is NOT the active app and never becomes active. The hover text opens and remains open on top of any other window you might move over it. I had seen this before but it is not enough of an issue for me to be annoying because my screens and work habits rarely have me passing over open code if I am not going to work on it.