If you're on a Mac, remember that when you're in Limewire you have to use control-C and control-V to copy and paste.

So if you copy something from elsewhere on your Mac with command-C, you have to paste it into LW with control-V. (and vice versa.)

Which sucks, of course, and should be fixed, but I think the nice folks at Limewire have bitter fish to fry right now.