Thnx for your quick reply.
I don´t see an option to enable debugging. If I try the global configuration I get the error: "An error has occurred.
42883 42883, 7, ERROR: operator does not exist: character varying = integer LINE 3: WHERE "client_id" = 0 AND "home" = 1 ^ HINT: No operator matches the given name and argument types. You might need to add explicit type casts.
If I try to enable the debug plugin, I get the usual message: "Call to a member function getGroup() on null" when I click the Plugins entry on the system dashboard.