I've just installed Limewire Pro on my mac yesterday. I'm running mac OS 10.3 and I also keep getting an internal error while using Limewire Pro. I think it may be the same problem but I'm not sure. It happens to me when I'm in the search tab after initiating a download. I notice it after leaving my computer for a few minutes so it can download. This morning did what was suggested in the link on the suport page to do with a Java issue acknoledged by apple. I thought that that had fixed the problem because it worked and I managed to get a couple things downloaded off of Limewire. However then the error started up again and I haven't been able to finish any other downloads. I'm nor sure if any of this has helped you diagnos the issue or if it's even related at all but hopefully it can be worked out. Peace.