OpenEmu won't close

[Cardinals5]

So I just downloaded openemu with the intent of playing NBA 2009 for the PSP on my Mac. I can open it but it just shows a blank black screen with no sound of picture. So I decided that maybe it was the game so I download Call of Duty Heroes also for the PSP and indented on putting it into OpenEmu. The problem is that OpenEmu won't close NBA 2009 and allow me to go back to my game library. Its frustrating that I can't even play NBA 2009 but that it wont even let me attempt to play another game. Any help would be appreciated thanks!

[Zorlon]

Try and move or rename the NBA iso/cso file

Though I am not a OpenEmu user or even a MAC user, but seems logical that it would not be able to load something that is not there to load

You may also need to look for cache files or some other kind of memory dump/save state for the PSP part of openemu