Edwin said:
Switch to default theme then back again, works for me.
Yep, the new color accent has some interesting 'features'. I set up one and there two or three more - there are areas that have one one of the other colors.

I started with blue-green, went to black (which turned out to be brown - a few tweaks got it to be black), then an orange to highlight and finally green. Some tiles are blue-green (notification), some icons are orange (background alerts), other areas retained the black, but most are the color I want. It's kind of cool, but ...... it's a bug, not a feature

Except for the notification tiles, only the non-Universal app icons/tiles are affected. Universal apps carry there own color information.