Screenshots /bugged? (need help,plz...)Follow

I haven't been able to take an in-game screenshot in over 2 years. It seems as though my 'screenshot' folder is full, or there is a bug that won't let me take anymore. I CAN take a screenshot, but when i open my SS folder, all the pic's are blank.

I have tried deleting some older ones, in order to create more room for new ones; but that didn't work. Read a forum post a long time ago w/ ppl having same prob, but lost the thread, and i didn't print it out :(

Can anyone out there help me figure out why i can only take blank screenshots ingame?....what the fix is to be able to take new ones.

Thanks for help...kinda miss being able to take shots of mobs and memorable moments.