Connect button greys out after clicking, game doesn't launch

[Aezron]

Hello,
I click the active/yellow button "Connect", the button greys out but nothing else happens (game doesn't launch)? (Web server and Login server icons are green)
The game has worked for me for a long time before without issue and I can't think of anything I've done differently from yesterday to have it not work.

I have already tried restarting PC, restarting RoRLauncher and trying to connect several times, I have used Repair, I tried switching to 32-bit launcher and back to 64-bit launcher, I made all the folders not read-only, and it isn't blocked by my firewall..
Anyone else got a similar problem recently?