Automatic Font Color is white

In an Impress document, I have the automatic font color set as white, while in the libreoffice Preferences
this is set to black. Having automatic as white makes the default of any text color to be white, which is
very inconvenient. Where can I change the automatic color of the font?
Thanks
Agus

Might this be because your changed the default template?

May be, or perhaps because I’m recycling someone’s else presentation. How could I fix it in that case?

Press F11 to open Styles dialog. See if “Default” or any other style has white color (it’s under Font effects).