What is going on?!

Not sure if this is related, but I just did a fresh format and install of my OS and I just went to RPCS3 homepage and windows and linux builds (I use Win 11) are unavailable for download. Never seen this before.
(Note to self, always backup last working emulator installer before format).

But maybe something is going on and they have suspended downloads till they work it out? This seems plausible to me after reading your post.

late to reply but just confirming this did work for me. i just did this earlier today. i had the same issue as OP. all games working, then after trying to install and run my copy of wolfenstein a few days ago everything but one game worked. every other game loaded into black screen all of a sudden.

i redownloaded / deployed Rpcs3 after i cleared all caches / folders, added games but had no luck. same blackscreen no matter how many previous builds i tried. A repeated error i seemed to get was "unexpected Param.SFO found in directory" or something like that which leads me to suspect it was something to do with the file system or the directory. i also had to setup an exclusion to ignore the emulator and my games folder directory in my firewall as it was restricting access at one point. not sure if that's helpful to this or not.

after some prepping i decided it was best to re-organise the file list. worked first time. every game. including the game that seemed to break it all.