Hi DanielMuhlig, I have a hunch as to what may be happening. Please see my solution here in this thread:
Go to Settings > Google Language Translator, and then change settings to "Show Flags", so that it opens up the flag checkboxes.
Please make sure that at least one flag has a check mark there even if you do not want to show flags. After you do that, then you can select "Hide Flags" again and then save your settings.
Let me know if that was your issue. In general, just make sure that each settings has some type of value set, and then save accordingly.
Hopefully that works!