Empty action bars missing realUI theme

[Mythirion]

Hey, my action bars are a bit borked. They're currently missing the shaded crossed background on the empty action bars so it just looks a bit weird.

The empty background appears when I go to drag a skill/macro/whatever onto the actionbar but just disappears otherwise. Check the link for the screenshot.

http://adais.co.uk/ftp/Wow_2018-08-08_11-37-00.png

Was wondering if anyone knows how to fix it?

Thanks!