so the new patch came out and i tried to screenshot my game and when i pasted in onto paint it was just a black picture i tried many times still the same. tried alt+printscreen still same.

This occurs when you are in fullscreen mode for several games. There are a few workarounds for this:

1. Switch to windowed mode.
2. Use F12. This creates a screenshot in the screenshots folder wherever you installed league.
3. Use Fraps. The default keybind is F10.

I wouldn't think there is something they can fix since I think it is mostly windows not liking fullscreen for screenshots.

Hope this helped.