Findingnemo, I had a situation where even though not a centralized exchange, but an online payment system (essentially also a centralized organization) froze all my accounts precisely because of a bitcoin transfer. In order to unfreeze the accounts, it was necessary to go through the AML procedure. Fortunately, I managed to prove my case and my funds were unfrozen. Regarding centralized exchanges, I would not vow that they will always be loyal to incoming bitcoin transactions.