Ok, so here's the thing (I also hope this is the correct forum):
2 things about my setup at first:
I got a GTX 670 and a 1920x1080 main monitor and 1920x1200 second.
Now to the problem, it actually started today for no reason which is the strangest thing about it.
All flash player videos/streams (or whatever you call them) that I put into fullscreen (normal is ok) are stretched to the right, but only if I have the fullscreen on my second monitor. I tried switching monitors from left/right to right/left without success. I use chrome mainly but also tried it with firefox. All drivers and flash plugins are also up to date.
I tried one thing: I took some random thing from my desktop and tried to drop it over the edge of my second monitor, where it'd normally end (at least I thinkg so), and it like vanished completely. Then I could even open it and right-click it there which opened the menu.
The minimize button or so which normally is like at the bottom right corner of most flash players and all the other buttons down there are still working but they are really far off the screen.. along with like 10-15% of my video.