Problem with onion skin colors at Harmony Essentials

Hey everybody,

My onion skin colors have suddenly turned black instead of red/green. I want to change this but I don’t know how. When I go to preferences>general, there is no “colors” button, so I can’t change any colors.

Can anybody help me?

Thanks

I dont know if Ess looks the same as Adv as I use but in Adv if you go to Edit/Pref/General there is an area called Colors and there is a button “Edit Colours”.
There you find how to change colors.
Choose Drawing in the window that opens.

But this things when it turns black could maybe be of another reason.

/ Mattias