there is a server option for the ap system.
we have it on SL and if its turned off..I don't believe players gain AP, they still loose it but can heal no matter what.
its apsystem=true is the serveroption. It was something that Stefan told us about since we were having problems with the AP system not working correctly on SL.
Atleast that fixed it..I think. X_x maybe it was something else.