Hi there!
So, I upgraded to Logic Pro 10.8 and found that all the MIDI notes I recorded through my Kontrol S61 mk3 were duplicated in the regions. This seems to be happening with Komplete Kontrol plugin only.
The transport bar on my setup shows MIDI in and out as well and it seems that the MIDI notes from the regions are coming back IN to the DAW as though it were played again during playback.
Also, the keyboard interface with the DAW is a bit janky now; switching between tracks seems to get stuck and only show the light guide and played notes show for one track and won't focus on another when switching between them.
I had a fiddle with the MIDI inputs and outputs, but to no avail. Having gone back to Logic 10.7.9, the issues aren't there any more, so I would recommend holding back for now, until they can sort it out.
I hope this helps and if anyone has any advice, that would be great, too!
[EDIT: Looks as though this is ONLY happening with NI keyboards... So something's awry this end.]