over 2 years ago - AndrewT - Direct link
Supported resolutions for your hardware are listed in Documents/Paradox Interactive/Stellaris/logs/system.log file. If you use a resolution not there you can get such problems.

You should also delete the cache and shadercache folders in that Documents/Paradox Interactive/Stellaris folder, so the game can write it out again appropriate to the new hardware.

All the best!