There might be no viruses that will affect BBs, but enough folks seem to have some problems after emails or whatever.
It's enough sometimes to wonder if there is one, cos the thought just plain won't go away.
WhiskeySwiper....download this, register it and run it. It's an antivirus for Blackberrys, mentioned in a few threads on here.
SmrtGuard Free Download
I'm afraid that Im not one that believes in co-incidences, everything has a reason. If the Smrtguard doesn't find anything then it's got to be the rougue program that's done something, but how you would get rid of that and it's effects I don't know.
Good luck with it.