Reply to Instant Gratification has effected S4 FX Buttons

I've been using DJTT's Instant Gratification on an Akai MPD24 and am wondering why the mapping has effected FX unit buttons on all four decks of my S4. Only two of the eight buttons actually still turn on the relevant unit and then light the buttons up.

I set up a user mapping to run alongside the default and have managed to fix it so all of the buttons now switch on the deck they are supposed to but I can't get the LEDs to work. The best I can manage is to get a brief flash when I push the button and engage the FX unit.

Any advice? I'd like the S4 to run as it's supposed to and I consider it important to be able to know whether my FX units are on without reference to the computer.