I bought a midi controler, but i dont have de marshall code to program the midi control

I have a Nov 2017 build, and have had this problem from the beginning...tried to work around it and it is now becoming unusable for me.  In short, the amp responds fine when setting things up...but it it becomes inconsistant as the session wears on.  Accepts commands and switches one time, then doesn't the next time, etc.  I've seen others complaining of this on other forums.  and have yet to see any definitive answer.

Is anyone using the PEDL-91016, and if so, does this wotk as advertised?  Or is this a DSL midi issue?