My G-Nex running the latest Cyanogenmod 10.1 "monthly" has had problems with sending and receiving any kind of MMS message. The weird thing is it's only in Handcent. If I send a picture message it shows the "sending" circle that spins for infinity. Same with when I try to download a picture message or or mass text, it just shows the "downloading" circle that spins forever. I am not sure if I can send mass texts or not because I never do that, but I'm assuming that doesn't work either. So if I go into the stock messaging app any kind of MMS will download or upload with no problem.
I've already tried changing Handcent to the default messaging application for All(SMS & MMS).
This was never an issue to me to just download/send any messages I need to in the default messaging app and then return to Handcent but now my wife has an identical setup to me (phone, ROM and apps) and has the same problem. Life would be easier if I could figure out how to fix it.