Your system information

• Steam client version (build number or date): 1549129917
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: Do not remember and I can't look it up
• Have you checked for system updates?: Yes, everything is up to date.

Please describe your issue in as much detail as possible:

Since the latest version, the Settings window does not open when clicking Steam -> Settings in the menu bar.

Steps for reproducing this issue:

1. Try to open Steam -> Settings from the menu bar and observe that no window opens.