I had the same problem till I found a post on here stating that two of the hex color codes have typos. If you look at the skills window (in whatever mod you're running or the Default folder), equi_mainhud_skills.xml, you'll see that lines 10 and 22 have mistakes:
Code:
10: <ImageStyle Name="Spellcasting" progresscolor="7B5978">
22: <ImageStyle Name="Scholar" progresscolor="BEAD85">
Both of the color codes need a # in front of them, like:
Code:
10: <ImageStyle Name="Spellcasting" progresscolor="#7B5978">
22: <ImageStyle Name="Scholar" progresscolor="#BEAD85">