i earned around 900$ through adsense in the month of june through a forum.After a period people started posting adult stuff on the forum and demand of adult stuff was very high..so i had to create adult sections and had to remove adsense from the forum...however till now no payment has come from adsense in mid october i mailed them for the fourth time for my PIN....all three times before the PIN didnt reach me..Then they called me removed the pin limitation from my account...had a long chat with them on the phone and abused them a bit was excited that after getting the pin removed i would recv my cheque, but damm half of december gone and cheque still hasnt come... dunno wtf to do.........
I would email them ASAP. Had something similar happen to a friend a few years back. His whole earnings were rejected because Google said something was wrong with it. Since its been like 6 months, I would definitely get on email quick.
Keep your fingers cross! Don't be afraid to hound them. Especially if mid January comes and you haven't gotten anything.
Since you are having problems receiving the pin number by mail, the check might also have similar problems cuz its also by mail. Maybe you could change the address to a friend who lives nearby you and then request a reissue of the check to see how it goes.