I have tryed on the another set up (and version of Vmix) and everything was fine.

If you mean "Straight" and "Premultiplied" - yes. Both of them. (I tried both of them in Vmix too)
Version is Resolume Arena 7.1.0 PC

Hello!
I have problem to send NDI alpha from VMIX to Resolume 7. (black lines - artifacts)
In the NDI Studio Monitor and another Vmix everything is clear on alpha)