Ironsight
Downgraded to 4.11-13 to check if that would work differently. Same end result with the game closing, but in this case it doesn't even whitescreen as if it were going to start. The last error that I can understand in it is not being able to perform an ICMP ping due to a permissions error.
steam-783770.log
Tried it again today. Still breaks. I'm on an up-to-date Arch kernel and mesa/LLVM libs. Proton version 6.3-5.
I got the interest in touching this again because of what happened with Squad where there was apparently a fix.
https://github.com/ValveSoftware/Proton/issues/938#issuecomment-652620750
I did this exact process with the app ID changed to 783770 for Ironsight hoping it would work. It did not. I'm unsure if those "magic files" had anything specific about them tied to Squad's EAC implementation or if they are otherwise more generic. Either way, there was no visible change to how it crashed. EAC comes up with a loading bar, this time all my windows temporarily disappeared (instead of the white screen from last year), and then they come back and Ironsight crashes. Attached is my log, made after I applied the Squad fixes.
steam-783770.log
I got the interest in touching this again because of what happened with Squad where there was apparently a fix.
[#938 (comment)](https://github.com/ValveSoftware/Proton/issues/938#issuecomment-652620750)
I did this exact process with the app ID changed to 783770 for Ironsight hoping it would work. It did not. I'm unsure if those "magic files" had anything specific about them tied to Squad's EAC implementation or if they are otherwise more generic.
They're not generic. They are binary blobs containing game-specific glue code.
The game now runs perfectly if you install Proton EasyAntiCheat runtime. Give it a shot!
https://www.protondb.com/app/783770
After some game update, the game broke. It crashes after loading the EAC start screen.
The game stopped again. Please fix. It is unable to load Anticheat.
For those who don't know, this game comes to an end on August 6, 2025, servers will close.
Compatibility Report
System Information
I confirm:
PROTON_LOG dump
steam-783770.log
Symptoms
Ironsight has apparently been relaunched under a new AppID and this may have different issues than the original release, which had EasyAntiCheat as a main blocker. For me, EasyAntiCheat runs with a loading bar, seemingly finishes that, and then the screen goes white as if the game were about to start in fullscreen. It then just goes back to Steam and the game stops running. It crashes before getting to the title screen. Not sure if this is EAC shutting it down though, because there are ProtonDB reports indicating that players are getting into the game and then encountering other compatibility issues https://www.protondb.com/app/783770
Reproduction
Install Ironsight's relaunched release and try to start it.