UltraVNC

So did anyone ever find the solution to this problem, as I am having the same issue and have tried many different things, but no luck yet, any help would be appreciated. (same version and keys on both sides, both boxes checked, etc...)

Ok, so I'm setting up a network with 5 computers, all in various locations. I want to be able to use all of them as viewers and servers (shouldn't be a problem I don't think). They are all running Win XP (32) and AVG 8.5. The problem I'm having is that only one of the computers will allow me to view ...