Whenever I open Z3ta+2.1 or DimPro (both x64), I get a message box:
 
midiInOpen()
Error opening MIDI device.
 
But it does NOT happen on Rapture x64 (I installed the stand-alone version supplied with x2 Producer)
 
And yet all three have a check in the menu next to MIDI > 4-UA-25EX
 
Anyone else having this happen?
 

I used Dim Pro x64 quite a few times while testing things out for folks, and it works fine for me.  Rapture x64 works fine, too.  I'll test out Z3ta and post another reply with that.

Bob Bone

AFAIK  4-UA-25EX  is a roland audio interface.  Do you have a keyboard or controller plugged into the midi in?? that's probably what dim and z3ta are checking for.  

This happens to me whenever I use the microhost versions of Dimension Pro, Z3TA and Rapture. I have Cakewalk UM-3G as my MIDI interface. I checked the registry and looked for INI files that might be causing this, but no success. Its not a problem, just annoying.  Any ideas?