Media Player Problem

Alright...I have the newest version of Limewire, and I have been trying to play my music files, but everytime I double click them it just sends them down to the playlist. I have tried starting them from the playlist but that doesn't work either. The only time I can listen to a file on the limewire media player is if I preview something that is being downloaded. I have tried editing my options, but every time that I try to open the options box...it pops up for half a second and then disappears. It's very frustrating. I've tried uninstalling and reinstalling and nothing changed. My files work in windows media player so it isn't the files. Somebody please help!