I have FF XI, all 4 expansions and all 6 addons, ACP, AMK, ASA and Abyssea and play on PC, PS3, and 360
bought and registered each on PC and went to PS2 (now PS2 version on PS3) and 360 with no probs going back and forth between them.
Not sure what prob ya having or why, can ya explain anything else that might help with what the prob is?