Hello @brain-anti-freeze, for clarity, please verify that the beta you're referring to is Steam's client beta.
Sorry, yes the beta I'm referring to is the Steam client beta.
Hmm actually I thought I should try opting back in to the client beta to verify the issue ... and its still working fine after opting back in. Perhaps something happened when the beta update applied that messed up my installation and re-installing has fixed it. I'll be sure and try that first next time before logging an issue.
proton 6.3x1 2021-09
Your system information
Please describe your issue in as much detail as possible:
Games all launched fine in the prior beta, now no window is displayed, processes run for approx 1 min then quit. I tried both current proton 6.3 and experimental and deleting and re-creating the prefixes. All games appear to be affected. Backing out of the beta fixes the issue completely. Attached are two logs, one of The Ascent failing with the new beta and the other of it working after opting out of beta.
Steps for reproducing this issue:
steam-979690.log
steam-979690-broken.log
.