Reply to S4 Fx Units buttons not working properly

Hey guys,
as of a few days I've been running into a bit of a problem that is not critical but bothersome. I will try to describe the issue as clear a possible and maybe someone would have a solution out there. Currently running Traktor 2.6.1.; my S4 Driver is up to date as well as Service Center and Controller Editor.

The FX unit selector below the gain knob of each channel in the S4 is having a rather odd behavior.

FX 1 only works on decks C and A
FX 2 only works on decks B and D

Main issue for Decks C and A:
- LED on FX1 works but not in FX2
- FX2 does not work or lights up
- FX2 only works via MIDI not HID, and only lights up in the Controller Editor

For Decks B and D - is the same issue but affecting FX1.
So on the left side of the controller only FX1 will work, and on the right side on FX2.

Ideally you should be able to select both.

I've installed and uninstalled the S4 Driver, the controller editor. Cleaned all other mappings. I feel like I just hit a wall of frustration and can't believe on anything else before looking into Service from NI....any ideas are appreciated.

Cheers.