Mmm...do not really understand what you mean...
With the faulty situation VPX loads everything. Now I replace the existing dmddevice64.dll by a newer one and it will not use/load it anymore, nothing else changed.
And yes, VPX itself will make use of this newer dmddevice64.dll as it is in the vpinmame directory.
But I do suspect the XDMD.dll and XDMDNative.dll or the collaboration with something else (dmddevice64.dll ??) because when I replace these with older ones it's all fine.
So, for me no problem, take this issue as solved but (at least for me) out-of-the box in combination with a pin2dmd it's not working.