How can I make Vuze work with Lion? (It cannot transfer any data)
Essentially, Mac OSX Lion has issues with java. 

I'm pretty sure this is a Java issue. Apple's support for Java in 10.7 is severely lacking. I had to download (wasn't installed with 10.7) Java 1.6.0_24 using Apple's ADC (developer) site.

Installed Java and restarted my Mac. Launched Vuze and I was able to receive incoming traffic. Paused the download and it all ended there. Vuze now keeps crashing and I'm still not receiving any incoming traffic again.

Source: http://forum.vuze.com/thread.jspa?threadID=96592