This is caused by a glitch in yesterday’s SteamVR update, which fortunately Valve already fixed it in the latest SteamVR beta. You can either wait until the changes to the beta branch make it into the normal branch or alternatively switch to the SteamVR beta in your Steam client.
If you don’t want to use the SteamVR beta, you can disable “Crystal Image” in the image page of the vorpX ingame menu as a workaround for the time being.
I would suggest to use the SteamVR beta though. This way you don’t have to revert the settings change later.