User account control problem at Windows 10

#1
Hi all,

I just moved to Windows 10 and now I'm looking for a new DVB-S program. So I tried out the current version of ProgDVB (7.12.6). I'm very pleased with it but I stumbled over a problem: whenever the user account control kicks in (because I want to start another program as admin or something else) the video freezes while audio keeps running. I can also change channels and the sound changes to the new channel. The video remaines freezed. If I change the size of the video window or switch to fullscreen, the window becomes black and also audio stops playing. The only way to get I back to function is stopping ProgPVB and restarting it.
I'm using ffdshow as decoder and EVR or VMR9 renderless as renderer, but I also tried every other renderer with the same effect. ffdshow shows in its info pane, that it is still decoding video even when the picture is freezed.
I'm using an AMD Phenom II X4 with chipset graphics (HD4290).
Any ideas except switching UAC off?