It does seem to coincide with the scroll bar appearing, and yes, the tree view in the filesystem viewer has the same issue. I don't have many other PS1 ISOs on-hand to test with but I'm working with another developer who's experienced the same issue, and there's a post on RHDN's forum talking about ...

Hey all,

I'm trying to use no$psx to do some PS1 debugging, but the object list in the vram viewer goes blank a few seconds after starting a game. Unfortunately, neither duckstation nor pcsx-r have this functionality. It provides a lot of useful information when working, and I'm kind of up a creek ...