This issue appears to be widespread.

Versions 1.7 and 1.7c worked brilliantly with me. The minute I downloaded for 2.0 OSX, though, I ceased to be able to raise more than one connection. And now, those older versions won't even work in Classic -- they crash upon startup. Now, if I enter so much as a single character in the Search field, LimeWire 2.1 crashes. I don't even have to start the search -- it just crashes. And because something in the Install clearly monkeyed with my older versions, there's no going back and running in Classic anymore. DO NOT DOWNLOAD FOR OS X, FOLKS --there's no undoing the damage.