Pre Central reports two bugs with the Verizon Palm Pre Plus:

• When WiFi is on, MMS messages aren’t able to be sent. It looks as though the issue is that MMS message need to go through Verizon’s EVDO network, but the Pre Plus is attempting to send them over WiFi. This isn’t an issue for Sprint users thus far. The good news is that there is an easy workaround: just turn off WiFi before you attempt to send an MMS message.
• it’s starting to look like there is a fairly serious issue with GPS on Verizon Palm Pre Plus devices. The concern is that full, tower-assisted AGPS is only working for VZ Navigator and not other apps. A workaround that seems to help some comes from m0sim: open VZ Navigator (even if you haven’t purchased it on your plan) before using GPS on other apps. GPS is a finicky feature, so diagnosing exactly what’s happening here is going to take some time.