Hello,
In some templates, the color of the Template Switcher Font is white, same color as the background of the Module. How can i change that?

Hello Grob,

to define the color you should edit the file ... /modules/mod_templateswitcher/templateswitcher.css
on line 3 class templatename insert color: #color_you want ;

If you want also define the hover and active status create a new class
.templatename :hover, templatename :active, template :focus { color: #color_you want; }

I will sent your question to the dev. Team as improvement suggestion.
I hope my answer is helpful to you!

Regards
Caro