Before I install, is the new Pro Upgrade compatible with Mac Leopard? That's all I need to know.

Thanks muchly.

Yes.
Some people are having problems. Most don't.

Just loaded LimeWire Pro on my new 20" iMac with Leopard. Works fine so far.

I'd be curious to know whether those that 'are' having problems are using older computers or the newest ones. A possibility of old files of some sort conflicting, else perhaps the 64 bit conflicts, etc. From what I've seen it seems to be a java problem. But java can be affected by other things. Perhaps drivers, etc. I am just guessing out loud at moment.