Maybe it’s a RAM issue? That’s the only thing I can think of, since I’ve seen browser pages go blank when I run low on memory. I’d open your Task Manager and keep an eye on the percentage of memory used as you’re browsing game pages. (If it doesn’t show a percentage, right-click “Memory”, go to Resource Values > Memory and enable Values.) If it seems to only crash or turn blank when memory usage is high, then it might be an issue of the apps or browser tabs you have open; perhaps look into what apps you have set to automatically startup when turning on the PC. I can’t offer much more advice without knowing more, but I hope this helps solve the issue!

Which OS and itch app version are you using? Could you share a link to one or two game pages that go blank, and check whether those same pages open in your regular browser? That should help narrow down whether it's specific to the app.