Confirmed this was the issue for us. Accessing the computer over RMM with default VeraCrypt install options does not work. Installing with disabling the protection against screenshots and screen recording works as needed. I have not tried RDP direct to the machine in either install scenario.
After looking at the version history, the biggest related item between 24 and 20 seems to be just that. I'll try disabling the protection during install. Thanks for the lead!
That could be a factor since I'm remoted in to the computers in question via our RMM, but I tried 1.26.24 on two different computers, no dice. Then I installed 1.26.20 and that worked. Don't get me wrong - has to be something system-related as a local install of 1.26.24 worked just fine.
Were you able to get this figured out? I have what I believe is the same issues. Tried two different computers with the same outcome. I've installed from MSI, EXE, and tried portable, when I click the icon or EXE, the window for the application is just black.