I've been experiencing big time memory leaks with limewire, even 4.2.6
I'm on Panther 10.3.7 and 1.25MB of RAM, although I had only 768MB until recently.
The real memory consumption keeps gradually increasing over time, and the virtual memory takes really huge proportions, until a crash occurs after several hours.
Even if nothing much is going on, no new searches, no new transfers, it only takes a while longer to crash, but it always ends up crashing.
I transfer few big files (over 100MB a piece), from only one source overseas, who unfortunately is on modem, so it takes forever to transfer, forcing me to leave LW running 24hours a day, so it always needs to be restarted.
I've watched the virtual memory consumption go sky high, such as over 5gigs, although lately it's been crashing well before that, before it even gets to about 2gigs.
Running new searches and adding new transfers, or even just triggering existing searches or existing transfers to resume, accelerates the memory consumption.
LW is a very messy hog with memory and it doesn't seem to know how to clean up after its processes. Most of the time, the number of threads stays around 150 and can reach into the mid 200s, even with little action going on.