I updated to today's patch
now when I open spiral knights I get an error message saying
"We experienced a problem authenticating with Steam.
Please ensure that the Steam client is running and that you are not logged in elsewhere"
I am pretty sure I'm not logged in steam anywhere else as I only have this machine active for steam. And my steam client is currently running properly
Already restarted my machine just in case there was something else, I haven't updated any drivers or software.
Yup, same for me.