some midi buttons suddenly stop working

when using  DDJ-FLX4 with rekordbox 6.7.2 on pc windows 10 latest build, there are some bottoms that stop working. its not the flx4 becasuse i did a midiOX test  and all button/decoders/sliders, are working fine.

after trying tor reach support via email about this, no reply after 2 times  try was send back to today so that  sucks bigtime... 

also on internet nothing to find, so i started to kook it me self

first i reinstalled rekordbox to see if problem would be solved by deleting all older  places where rekb is installed, for instance ...roaming.... than i restarted pc, new install of rekortbox. 

and yes. now it works again  untill i hooked up a seconde devicae 

" the behinger X touch one ", with is a midi controller for Ableton live and is nothing more than a midi controller,

i added som buttons like slip on / off quantisze on/off ...ect... 

now when i hit buttons beatffx auot/tab, the corresponding buttons on  rekordbox are not responding , also button to choose other effects also not responding suddenly .. 

after reinstalling rekortbox i made a copy of the folder "poineer" in appdata/roaming and copied this before i change anything.

after again connected the flx4 and the X touch one. buttons fail to work again, so i replaced the just corrupted midi file whit the fresh copied one after reinstall,  and gues what.. all is good again.. ..so its a file that gest corrupted when adding other controller, at least that is what i experience.

now need to narrow this down to  the file were midi is stored and that file is called "FxUnitSettings" and i made it read only so now it does not get changed because i do not change  any settings that had to do whit my flx4

i just installed latest  rekordbox 6.7.3 and gonna play whit that .. hoop knobs stay alive here.