Hey,
most times when I unlock any item and then log off and in again, the unlock disappeared.
Same when I unlock anything and enter a game.
This is pretty annoying since this way I am unable to complete any of the challenges -.-

Here the bug description for the QA:
-Unlock is possible.
-When log off and in unlock disappeared
-Same when playing a game
-Also same when unlocking in lobby and then play
-Sometime the unlock stays (haven't figured out that jet)
-When I equip the unlocked item to a class it stays in that class even after log off / log in, but it isn't unlocked, so it doesn't count the kills for the challenges.

Hoping for a fix soon.

Well yeah, like I hoped for some fixes the last weeks -.-