Your system information

• Steam client version (build number or date): 1538437695
• Distribution (e.g. Ubuntu): Gentoo
• Graphics driver version (run nvidia-settings): Nvidia 396.54.06
• Gist for SteamVR System Information: https://gist.github.com/ryao/fe8d42b52fe3bb9df3f8ccdce8451cac
• Opted into Steam client beta?: Yes
• Opted into SteamVR beta?: No
• Have you checked for system updates?: Yes

I have this issue too. When I try to exit VR, I get an error dialog on the desktop with the title "Error - KIO Client" saying "Could not find any application or handler for vrmonitor://quit".

Need to register a vrmonitor:// URI handler like we do with steam://

Can confirm this is still an issue.

I am also able to reproduce this issue.

So now kio client pops up for me when pressing Quit VR, too. Calling vrmonitor://quit manually through xdg-open of course fails, too. Calling steamvr://quit, which actually executes the vrmonitor program prints out a lot of stuff into my terminal after returning (perhaps that's normal (?)) including it not finding a folder runtime but still executing the right binary in the end with the argument steamvr://quit. But that does apparently nothing. At least SteamVR doesn't quit

This seems to be fixed in the latest beta. Haven't had any problems with it anymore!