Hello @Jack-Balcombe, please add PROTON_LOG=1 %command% to the game's launch options, reproduce the regression, and attach the generated $HOME/steam-$APPID.log to this issue report as a file. (Proton logs compress well if needed.) Also, please copy the contents of Steam Runtime Diagnostics from Steam (Steam -> Help -> Steam Runtime Diagnostics) and put it in a gist, then include a link to the gist in this issue report.
Here is the log generated with Proton 10, where the Totem Arts Launcher doesn't even open:
ren_x_not_working_proton_10.txt
For comparison, here is the log generated with Proton 9, where the Totem Arts Launcher is working (I didn't bother running Renegade X itself since I can't even get to that stage on Proton 10 so there's nothing to compare it to):
@Jack-Balcombe the game should launch again on proton bleeding edge https://github.com/ValveSoftware/Proton/wiki/Proton-Versions#proton-bleeding-edge
PROTON_LOG=1x1 2025-09
Compatibility Report
System Information
I confirm:
Symptoms
Renegade X worked fine for me with Proton 9, but Proton 10 seems to have broken compatibility with the game. Both the game and its launcher (the Totem Arts Game Centre) do not run at all on Proton 10.
Reproduction
Attempt to run the Totem Arts Game Centre via Steam using Proton, and observe that it doesn't work.