You can unlock modules, weapons, attachments, and dog tags but it doesn't save the fact that you have, so every time you go to change your equipment you have to unlock everything again.

EDIT: Stuff like Aim Enhance stays unlocked, apparently.

Happened to me aswell, although only the first time I tried to unlock stuff.. Unlocked 3 perks, flashgrenade and holosight for the SCAR, joined a game - perks didn't seem to be working so I left the game, noticed all the stuff I previously unlocked was still equipped on my character, but I could still unlock them. Tried unlocking them again and now they stay passive, problem is I don't know wether or not the points I spent were refunded, so I'm not sure wether I spent 2x points for every unlock..

The points are refunded, I think- I unlocked an attachment for the SCAR, unlocked another, and I had 2 points to spend again.

I'm having the same problem as well. This release has more problems than Bad company 2 did for PC. Needless to say I'm upset.

And no I'm not upset because of this only; it's the fact that it takes so long to find a server that actually works.