Thnx everyone,
I tried advices, but the problem is still not solved. From monitor Nr1 fullscreen jumps to monitor Nr2 and it's not possible to move it to monitor Nr1.
I think it's really a bug and I hope it will be solved in next release.
Could please anyone confirm the bug with 0.9.8a version on a dual monitor display, when I make video full screen size on monitor Nr.1, the picture allways jumps onto monitor Nr.2.
This starts to happen just after upgrade.