Hello @eviley3, this issue is already being tracked at #6958. In general, wine needs the wineprefix to be owned by the current user to avoid an entire category of hard to diagnose issues and Proton inherits this behavior.
Closing in favor of the older issue report.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
Steps for reproducing this issue:
The game will launch from the account from which it was installed, but it fails to launch from the other Linux user account, even if both the users belong to the same group.