[texworks] Umlaut in Latex

[Andreas Hirsch]

Willem van Leeuwen schrieb am 22.03.2020 um 17:38:
> Dear Tuggers, 
> 
> I am working with TexLive 2019 and Tex Works as editor. 
> 
> Everything goes well, all letters, symbols and accents work as they should, except for the command \”{o}. What results is un upper index  dot-comma followed by an o. Is there anybody with the same problem, and what went wrong here? How can I get an umlaut?

To get some advice, a minimal working example would be helpful.

Andreas