Ok, I'll take a look later, but there's no need to make a video all the time, just saying
1 load a game while being in fullscreen, the game starts normally while in the gui
2 go fullscreen -> the screen becomes blank
It's shorter, takes less time, and is more efficient for everyone. I have tested this too fast, seeing that the gui seemed ok in fullscreen I assumed it was a windowed problem only. Later, then...
edit : well sorry for my mistakes, I was half awaken when I did that and it shows, I went way too fast especially for the video resizing part. For the sound I didn't think just opening the sound options would make such a mess in such a case ! Anyway it's fixed again, you can have your test which was indeed useful here : http://raine.1emulation.com/archive/tux/raine.7z