Import and catalog greyed out

Topics: Configuration Issue
May 5 at 3:16 PM
Recently I have the 'export an update' and 'manage catalog subscriptions' greyed out.
May 25 at 9:14 PM
I searched some weeks for this.

Meta-Data for subscribed catalog has an error.

Delete the corrupt/wrong file(s) under \WSUS Package Publisher\Subscribed Catalogs\MetaData

I had only one file there from a first try to add a custom catalog.