Proton Experimental (The bleeding edge branch) breaks some Source Engine games

Compatibility Report

• Name of the games with compatibility issues:
  No More Room in Hell: 224260
  Pirates, Vikings, and Knights II: 17570
  Fistful of Frags: 265630

System Information

• GPU: Nvidia GeForce RTX 4060 Max-Q / Mobile
• Video driver version: Nvidia 565.77
• Kernel version: 6.12.11
• Proton version: Proton: 1737898151 experimental-bleeding-edge-9.0-155925-20250126-p2152e5-w023c900-dc6dc7e-vdeeb3c

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Proton Logs:

steam-224260.log

Symptoms

Launchig any of these games using the bleeding edge version of Proton Experimental causes the games to launch to a white screen (for No More Room in Hell and Fistful of Frags) or to a black screen (for Pirates, Vikings, and Knights II). This does not occur with the regular version of Proton Experimental.

Example 1: No More Room in Hell:

Example 2: Fistful of Frags:

Example 3: Pirates, Vikings, and Knights II:

Reproduction:

1. Install Proton Experimental and from the beta select bleeding edge.
2. Launch any of these games using Proton Experimental.

OK. Proton Experimental (bleeding edge) just updated right now and the problem no longer seems to occur??? I guess we can close this issue?

[kisak-valve]

Hello @Reikott, the bleeding edge build of Proton Experimental is automated and untested, sometimes odd quirks happen. Glad to hear it decided to behave for you. In general, look alike issues need to be evaluated on a per-game basis, so if something similar happens again, please add a note to the individual game's compatibility report(s) with logs.