I'm using PC 184.108.40.206 which seems to be fine to me. Earlier versions did create various problems I agree. The best advice I can offer is to provide as much information as possible. Basics such as OS, browser version, any applications open, what website you were trying to look at. All this can be used to isolate the problem.
I would uninstall Policy Central from the computer and see.... It's been causing no end of trouble here, with crashing IE, even though we dont use any of the web features of PCE.