I've had ROCK running on an intel NUC for two years. Last week I had several issues and research suggested faulty SSD. I installed a new one and all good. I later tried ARC and I'm stuck at a screen that says "Time for an update, update Roon core to continue" In Roon controller it says I have the latest version installed.
The last update was three hours ago. I would go ahead and update your Roon core and clients now. Otherwise, you could just reboot everything and see what happens.
What version / build of RoonServer is running on your ROCK? Today’s update of ARC does require the version of RoonServer that was released today so there may be a lag in your ROCK taking that update.