I Understand what Sasa is saying. I had the same troubles with my dark toolbars. If you have a dark toolbar and want the font of all buttons to be white, you set it to white on the Label Color for that toolbar. But now you just turned all submenu items to white as well and the default submenu item's background is white'ish. turning on "Image is inherited by submenus" (assuming you are using an image) isn't enough because some images used on the toolbar don't tile correctly or just look darn right wrong.
To fix this, on the selected toolbar, leave the Label Color alone or set it to what you want the submenu items to look like. Then you have to edit each button manually (the root toolbar buttons) and change them to use a lighter color text.
I was going to request this get changed is someway but got lazy and didn't want to give the opus team any more work to do. But now that Sasa brought it up
But this wont fix xtacbyme's problem (I think). The above Sasa problem is only on toolbar's and their submenu's, not right-click context menu items. I have no idea how xtacbyme got that, and for Files only