I'm afraid that I can't help with your specific issue, but you may have more luck in the Mac forum.
Unfortunately, many people have issues with PocketMac and often the advice given by others is to give Mark/Space Missing Sync a go. However, since your MBP doesn't seem to see the device it may be that PocketMac isn't the culprit and you would have the same trouble with Missing Sync. As far as Leopard goes, I know that some people have had problems with PocketMac and Leopard. I don't use PM, but Missing Sync has been working ok with Leopard for me.