I'm running Mac OSX 10.1.3 on a dual 1ghz G4. My earlier Limewire version was working fine. I got Limewire Pro and have recently lost the program window. Limewire apparently opens fine, as the menu appears and indicates that I have a connection. But without the window, it's of little use.

I had this problem and it turns out that for some reason (bug?) Limewire had at some point minimzed the window to an extremely small window in the upper left hand corner of my screen. I would have never noticed it had it not been for another forum user (jstern).

Take a look and see if that's the problem. It was literally reduced to a line that is only 1 or 2 pixels wide. If you see this line, drag it open and you should be good to go.

Good luck.

yeah, i had the same:
i switched to the smallest screen resolution (640*480) and voila the main screen was back.