Interface language with newest Opera

It seems like with the newest Opera release, my interface language cannot be changed from English to German. Maybe the Opera update is not the cause, but I don’t know anything else that has changed on my system. I also get two errors shown in the log everytime I refresh the site:

30. Sept. 2017 15:44: Request for http://localhost:8200/api/v1/systeminfo gave error
System.IndexOutOfRangeException: Der Index war außerhalb des Arraybereichs.
   bei System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   bei Duplicati.Server.WebServer.RESTHandler.ParseRequestCulture(String acceptheader)
   bei Duplicati.Server.WebServer.RESTMethods.SystemInfo.SystemData(RequestInfo info)
   bei Duplicati.Server.WebServer.RESTMethods.SystemInfo.GET(String key, RequestInfo info)
   bei Duplicati.Server.WebServer.RESTHandler.DoProcess(RequestInfo info, String method, String module, String key)
   
30. Sept. 2017 15:44: Reporting error gave error
System.ObjectDisposedException: In einen geschlossenen TextWriter kann nicht geschrieben werden.
   bei System.IO.__Error.WriterClosed()
   bei System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   bei Duplicati.Server.WebServer.RESTHandler.DoProcess(RequestInfo info, String method, String module, String key)

Thanks in advance!

Ok, a restart fixed it. The system settings did not show any language previously, but now they do.

Glad you figured it out!

Out of curiosity did you restart Opera, Duplicati, your whole system or some combination of them?

I restarted Duplicati and left Opera running. Opera automatically updated on start, so I guess Duplicati was already running at that point and got confused.

Thanks for clarifying!