captdan
In Memoriam
The problem with doing that (DM sending MTC) is, the DM's RECord key will become non functional. At least that's how it's been on my rig. For tracking and editing, I make PT the MTC master; that unlocks the PT transport so the Dynamic Transport function can be used. Then for DM automation, vice versa. It's never been a problem because I don't need access to Record in a mix. (It's not necessary to use the DM's automation for the board to send MTC.)
In any event, the DM shouldn't lose time code with either setup. Ernie/Jamsire's suggestion should be followed - try another MIDI output. And if that doesn't do it, try increasing the freewheel - first on PT alone, then add the DM's freewheel.
There's one other possibility: something amiss with the MoTu unit. Are there any adjustments on that box?
CaptDan
In any event, the DM shouldn't lose time code with either setup. Ernie/Jamsire's suggestion should be followed - try another MIDI output. And if that doesn't do it, try increasing the freewheel - first on PT alone, then add the DM's freewheel.
There's one other possibility: something amiss with the MoTu unit. Are there any adjustments on that box?
CaptDan