I'm not having any issues as I use Solex on a Nvidia K1. I also have a Mini2 on 11.4.4 that I can make work above 1080 if I use the workaround by starting to record and then go out and back in the (Solo) app. I'm just curious to see if the SidePilot app patched what ever incompatibility there is with the unsupported Solo app and supports the higher resolutions.
Retired I have time to help out by passing along good guidence (usually provided by others). The high res blank screen issue is a popular topic. There is a cumbersome work around. Now I feel confident to suggest SidePilot to overcome the problem.