Ludwig, that project I have that Dim Pro gets delayed when you freeze it, still does it! But not if I use a new project. I'm looking into this more also.
 
Let me know what you find.
 
Update: After playing with the "Input Echo-Auto Through" off and on, I got the same Dim Pro trk that was delayed to work correctly. Don't know if this will help you or not.

Grem
"Input Echo-Auto Through"

 
Is this referring to the Always Echo Current MIDI Track setting in Preferences > MIDI > Playback and Recording?
 
Shouldn't make a difference, and doesn't here.