launcher problem right after a server patch

[q1uant]

The connect button on the launcher is greyed out and unclickable. And just below that it says "File signature bad: interface/interfacecore/maps/mapmarkers01.dds"

[xpander]

Try repair from Launcher gog wheel.
If that doesn't work then try selecting Test server from same gog wheel in the Launcher. Let it update. then switch back to Production server and let it update again.