Just a tip for those like me who didn't realize this earlier.
All the VNXT reverbs I have apparently are mono in. I'm using Reaper. When I pan my sending track to the left (reverb is as a send effect), the reverb receives less audio, until at full left there is no audio received by the reverb. To solve this, in Reaper the send can be changed to mono, or one can place a plugin before the reverb that sums left and right channels to mono.