Parent WPF Client Window not on top after closing a screen set

Hi all,

I am observing some strange behavior with the WPF Client (SMP 2.3 SP 4). When closing a screen set (window), sometimes the parent window is in the background (meaning some other windows programs are on top of them) even if the parent window was on top of everything else before. It is not totally reproducible, but it happens quite often. It happens for overlay screens as well as for normal ones, I just don't see a pattern right now. Has anyone else observed this behavior?

Regards, Daniel