MIDI Playback out of sync

Hi,



I'm trying to play back a MIDI track I created, and the playback is simply not aligned with the MIDI on the PT sequencer. In other words, a note would be there - but would play a split second after it's supposed to, making the (bass in this case) sound completely out of whack...



Any ideas? Low latency monitoring is on.

Tried rebooting to no avail....



Thanks!

Mony