I play Diablo 4 through the Blizzard client that I added to Steam and today I saw that the update broke the game. And practically all Linux users can no longer run Diablo 4. Would this be a problem with Proton or Blizzard? How to investigate this? Steamdeck users are also experiencing the same problem!
Yup, it's broken at current time. You just have to wait for a patch to fix the problem.
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Well, I guess I'll have to wait and see.
Thank you for your reply.
I just tested it with the latest Proton GE, it didn't help. 
but worth a shot. Meanwhile I'm playing other games.
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It's lucky we have so many games to play. I don't take Diablo 4 very seriously since they mess up the game more and more with each season.
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Pregunta no hay algun metodo de revertir dicha actualizacion ? si tanto le gusta Ese Diablo IV solo pregunto..
Its working on proton bleeding-edge.
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give it a try - dwproton