System decimal separator not recognized

Hi,

Shortly said: All numbers are displayed with coma as decimal separator instead of a dot, while my system decimal separator is already set at dot. Why?!

I have already set my measures and value fields to decimal format, and clicked on this button "Display the values in this column with commas as a thousands separator" for every single measures / data field.

In File > Option > Regional Settings, I tried different "Locale for import" (USA, Germany, English (Swaziland), ...). Doesn't change a thing.

I also tried changing the format directly in the query using the local parameter. No change either.

Is there anything I'm missing here?

Here are my regional settings, FYI:

Thanks.