Set glyph color doesn’t work

Hi, I have a little problem since the update, seems that some glyphs (Odieresis, Ograve & Oslash, why just the three of them ?) won’t turn off their label color. I desperately try to press the cross it won’t turn off : ( What’s the matter with those guys ?

They most likely have a layer color. Hold the option key when clicking the color picker.

Ok just found that I need to press the opt key ! Thanks for the fast answer anyway. Why is this ? I can’t find any layers or so

If you have more then one master, you can give each layer a different color. Layer mean a bit different thing in Glyphs then in other apps.