I went through some 'unpleasantness' a while back here on the forums. There was some disciplinary action taken against me. I'm back now and all is well and good.
Some things, though: I don't seem to have all my functionality back - I can't mark my threads as solved once my problem has been taken care of. The *Mark thread as solved* option doesn't appear under the Thread Tools menu.
I also don't have the option to thank users when they've helped me with my problem (the little Thanks icon just isn't there).
It may or may not be connected, but I notice when looking at my user profile statistics, I don't have the ability to *Find all thanked posts* or *Find all thanks by*..