Have you tried the side volume button? Last night I uninstalled phonealarm and for some reason it turned the volume down all by itself. I didn't noticed until I saw I had 3 missed calls and the new calls were not ringing but were only vibrating.
I have most of the programs you have with the exception of Wisebar, Pocket TV Listings, and Treo 700wx Hacks. My phone seems to be ringing with no issues at all.
I have no experience with Wisbar, however, I've read that because of its complexity and functionality it can conflict with other programs. But you don't seem to have a program that manages notifications so I wouldn't see why...
Hope this helps a little...
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