First, I confirmed that the CentOS VM is using Xorg.
Using the openSUSE VM, I confirmed that the default x server is Xorg (echo $XDG_SESSION_TYPE responds with x11). I was unable to launch VIPM (unable to open x display). Changing over to Wayland, I again received the same error message.
I will be posting this update over in the NI forums, in the Linux Users group. Again, if anyone has suggestions, I would appreciate them.