Did you by any chance verify that the delay (or distance) settings in your reciever are correct?

You really should measure with a tape, and input the distances as accurately as possible. If they are wrong, the sounds will arrive at your ears at the wrong time, and really screw up the effects...

M- M60s/VP150/QS8s/SVS PC-Ultra/HK630 Sit down. Shut up. Listen.