Here's the information from the Options > Status page:
File Free 0 Bytes
File Total: 55443456
I think you're right about being out of memory. If I add an microSD card will that help it?
BTW, I'm uninstalling Epocrates, but I really would like to be able to use it. That's the thing I miss most about leaving m handheld computer. The BB beats it on everything else though.