I haven't had any problems connecting(that I'm aware of), but I have had an inordinately high number of bad cands on the machines that I do have running the client.. DSpy has even helped to identify most of them, thank goodness.
I should mention that my production is a low right now, 'cuz my 24port switch was needed over the weekend for a local LAN party that I attended, and after getting back(really late), I didn't hook it up again until Sunday afternoon. Even then, I decided I wanted to clean and re-organize "the basement", so it's gonna be a little while before most of the fleet is back up to speed.