There's a bug with 4.11.1 PRO on Windows that if your preferences directory is .limewire instead of Application Data/LimeWire, it won't start up after the first run (the first will work, the second and later attempts won't). You can fix it by deleting the .limewire directory (which will cause LimeWire to use Application Data/LimeWire instead for this and future runs). It's already fixed in our development version and will be in the next release.
For this and future beta bug reports, please use:
http://www.limewire.org/forum/forumdisplay.php?f=75 .
Thanks.