With 8.3 the method cisco uses to port forward has changed a little bit:
It should look like:
access-list inbound extended permit tcp any object ob-192.168.1.3 eq 3389
object network ob-192.168.1.3
host 192.168.1.3
object network ob-192.168.1.3
nat (inside,outside) static interface service tcp 3389 3389