What can cause that?

Your error seems like a code error, or something not supported by a browser. No idea though if it is a setting causing this to run on one of your devices and not the other, something just changed, or if the other person's issue is even related. Just odd two of you have same issue within hours.

If I was to guess, I'd say it's related to dark mode, or auto-dark mode. I can't remember the exact versions where they introduced proper dark mode support to Macs, but it seems like that's a probably cause looking at the errors.

Agree Scott, just weird two new reports at same time... although the other one has no detail than just blank screen...

Idk, well, at least I’m not the only one. I’ll turn off dark mode then

If that fixes, please report back

I tried it.... DID NOT fix it, the errors keep adding up and slows down my Mac

Put more info in your bug report is all I can suggest at this point.

Ok.... well, not being the only one helps 😆

Can you upgrade Safari on that box? What version is it at? I found Supabase changed code in Jan, that would cause Safari before 14 to not work. It is a very esoteric change....

I looked at upgrading safari, but it dosnt say there’s a upgrade. The Mac It works on is from 2014, the one it isn’t working on, is 2019