I am not using WB, and the problem exists.
I'd like to find solution for this....
Which menu style are you using, where is your taskbar positioned, do you have anything running like Ultramon/display fusion?
Also how many monitors, does it happen if you press the windows key or just the taskbar start button and is it out of position the first time you open it?
Finally what resolution are your monitor(s) and what scaling factors?
Sorry lots of questions.
and a screenshot would be useful.