I dare say this happens to anyone, but how often it happens may vary - and I don't know what that depends on.
A reboot may help, but I sure never used that as a solution;
Click on the taskbar icon several times, so you see the form go the left and from the left back to the taskbar again; When it is on the taskbar (so, the last time you saw it coming from the left), then close it, and restart XX. It may still take you 3 or 4 times, but eventually you will succeed.
I must say that during normal playback it never bothers me, but during development and testing all the more.
Yes, it is really annoying, and I *will* solve it for the next version (I already tried hard, but just didn't manage thus far).
Peter
PS: I changed the title for clarity for others (and yes, you are the third reporting this
).