I see that these particular posts are very old. However, I have had this same problem with Limewire - shutting down - not at the "upgrade to Pro", but at the "Limewire Tips" window??? After trashing all related files and reinstalling several times and frustrated, I went deeper into my sweet Dual 1.8 GHz PowerPC G5 (Mac OS X 10.5.5) and found threads or scripts that specifically instruct Limewire to "shut down". I know very little about internal workings of a computer (graphic designer by trade). However, this is a big 'ol red flag and logical assessment - don't you think??? Hey, there is written bugs that instruct Limewire to "shut down". I have concluded that I need bug remover information . . . I found that this bug got it's way into my computer through Limewire, which causes problems with Limewire (strange). It seems that these bugs are designed to irritate the hell out of anyone who might use this program. Any qualified Limewire bug exterminators out there???