Scratch

This is whats wrong with my project...

My project is a math adventure game. It only supports singleplayer. But last night, it crashed, and I had to leave my mac on overnight. When I woke up the next morning, it was still lagging. So I "force quitted" it and then I opened it again. And everything was still there!!

But now comes the problem... I have 2 players on my screen, and I can't delete one of them! When I try to delete one of them, the one that I didn't want, it told me to select "grab screen region for new sprite" or "save picture of stage". So basically, the program can't detect it!! Can someone help me??? 

By the way, I'm using a Mac OS X Snow Leopard.