I have done everything too try fix it, is it just because i have vista?
Is anyone esle using vista and having problems with libra?

If you have tried everything its safe to say its down to vista.

Until Libra changes the way it takes screenshots (which is a nasty, long, horrible and buggy process to change) black screenshot's will always pop up.
Nothing you can do to stop it :(

set your colour scheme to windows basic before you launch libra , it worked for me ( but i have win7 ....an operating system that works:P)

It's Vista, enjoy your screenshot cleaner.

:( i hate vista, ill change soon as i can, or when i can be botherd :P

vista sucks balls!

Mine somehow managed to fix itself. Although at the time my steam shorcuts were not working and when I fixed that issue it fixed the issue with the screen shots. I believe it could be something to do with the file path. But hey I could be totally wrong.