Same thing just happened to me a few days ago. What sucks is, not only does it reset your weapons/level progress/access to Professional difficulty, it also resets all your achievement progress, INCLUDING for the online ones (i.e., billion dollars). I know because I was keeping track of the various ones I hadn't unlocked, and after the glitch it took the full amount to get them (e.g. it took the full 25 partner revives to unlock that achievement). Really annoying considering I lost ~$300 million for the billion dollar one.
If you can't be bothered to send a text with your friend request, then I can't be bothered to accept it.
Currently boosting: Battlefield Bad Co., Halo Wars, Ninja Gaiden 3: Razor's Edge, Quantum of Solace, Riddick, Saints Row, Resident Evil 5-6, SSF4, & Unreal 3.