Steam client version: 1769025840
Distribution: macOS Tahoe 26.3 (25D125)
Opted into Steam client beta?: No
Have you checked for system updates?: Yes
GPU: Apple Silicon (Mac16,12) - ARM-64
Please describe your issue:
Steam fails to launch on macOS Tahoe 26.3. The steamwebhelper process starts but immediately fails with Failed to bind shmem socket in chrome_ipc_server.cpp, causing the UI to hang indefinitely. Steam itself (steam_osx) runs and updates successfully, but the webhelper cannot establish IPC.
Key error from logs/webhelper.txt:
src/common/html/chrome_ipc_server.cpp (97) : !"Failed to bind shmem socket"
Tried without effect: -cef-disable-sandbox, -no-cef-sandbox, -cef-disable-gpu, disabling antivirus (Trend Micro), fresh reinstall of Steam AppBundle.
Steps to reproduce:
Install Steam on macOS Tahoe 26.3
Launch Steam.app
Steam hangs — webhelper fails to bind shmem socket
Hello @Rumukyu, issues with the Steam for Mac client are out of scope for this issue tracker. Please use Steam Support to reach the larger Steam support team.
System information:
Steam client version: 1769025840
Distribution: macOS Tahoe 26.3 (25D125)
Opted into Steam client beta?: No
Have you checked for system updates?: Yes
GPU: Apple Silicon (Mac16,12) - ARM-64
Please describe your issue:
Steam fails to launch on macOS Tahoe 26.3. The steamwebhelper process starts but immediately fails with Failed to bind shmem socket in chrome_ipc_server.cpp, causing the UI to hang indefinitely. Steam itself (steam_osx) runs and updates successfully, but the webhelper cannot establish IPC.
Key error from logs/webhelper.txt:
src/common/html/chrome_ipc_server.cpp (97) : !"Failed to bind shmem socket"
Tried without effect: -cef-disable-sandbox, -no-cef-sandbox, -cef-disable-gpu, disabling antivirus (Trend Micro), fresh reinstall of Steam AppBundle.
Steps to reproduce:
Install Steam on macOS Tahoe 26.3
Launch Steam.app
Steam hangs — webhelper fails to bind shmem socket