.JAR file will NOT WORK!! HELP!!

Okay, so I downloaded this program a few days ago, it was running great and it would open up and execute and everything so it would work. However recently when i click to open, it opens the application but nothing else happens. It shows that it is running and everything but the application isnt showing up so i quit it and reopen it and nothing seems to happen... can someone please help me? maybe i ahve done something wrong maybe i havnt i dont know but all my java settings have been set to proper and im updated and everything. im running on Leoperd 10.5.8 if that helps.

PLEASE HELP ME!

 

i have tried that already, i just tried again the exact same thing is happening