I got the same thing. I use Limewire since the Napster thing and everything was OK. But I always got an 'illegal operation' during exiting the program. The last few days I get the following 'illegal operation' after just 20 seconds online, while the hosts are still trying to connect:

LIMEWIRE executed an invalid instruction in
module <unknown> at 0000:00000075.
Registers:
EAX=00000074 CS=017f EIP=00000075 EFLGS=00010206
EBX=00002778 SS=0187 ESP=05e4f8f8 EBP=05e4fbb0
ECX=05e4f904 DS=0187 ESI=0087adb1 FS=67bf
EDX=816b5a48 ES=0187 EDI=05e4fbad GS=686e
Bytes at CS:EIP:
f0 00 f0 22 05 00 00 44 25 00 c0 a8 0f c9 00 45
Stack dump:
76003481 05e4f904 0087adb0 0087adb0 76002881 00807440 02a43c78 0080744c 76002d66 02a43c78 05e4fbac 010aaf70 75fe121a 00002736 00000000 00000000


Any ideas?