Reply to Traktor 2.6.0 not saving right

To me, Traktor is not saving/exporting mappings right.
After learning midi commands, everything works fine.
Then when I save the mapping and re-open it, suddenly some commands don't respond..
They need to be learned again, although the right command lines are already in the mapping.
I have this problem on 3 systems running Traktor 2.6.0, Windows 7 and 8, with any device.
User mappings or generic midi doesn't matter, it happens even with the S4 in HID mode.

Here's the deal:

* I Learned all FX unit 1-4 ON/OFF to note "C2" on a MF 3d
So I press C2, All 4 FX units toggle on and off.
I test it, it works great.

* When I export it, manually or by using the Big export button, it should be saved.

* When I open and re-import it, suddenly 3 out of 4 commands don't work.
The right corresponding CC command assignments are already there in the controller manager,
but I have to re-learn to make it functional again.

* After restarting Traktor or re-importing the mapping the commands don't work anymore...
Some on/off buttons work, some don't.

This is a specific example, but it happens to me with other commands, mappings and devices too.
Importing/exporting using the big button twice or deleting/adding the mapping manually doesn't matter in this case.
Anyone here that can replicate this?