Created attachment 132832 [details]
Abstract above and Electric Evolution below
For example Abstract: Abstract Electric Evolution (right-most at top row) makes the NB (contextual sections) dark blue, while others like Abstract: Abstract are shown more or less properly.
Neither theme is displayed as intended, actually.
*** This bug has been marked as a duplicate of bug 107266 ***
Are you sure that flipped themes are responsible for the opacity? Hard to understand.