I just upgraded to KDE 5.5 and, visually, I am enjoying it very much. However, some of the default Breeze theme colors are so light they are basically invisible. Which settings do I have to tweak in order to change this? Examples:

Okular:



The unselected "Contents" and "Reviews" buttons are basically invisible.

Krusader:



The folder icons are basically invisible.

Ksnapshot imgur upload dialog:



The action buttons are basically invisible, other than the selected one.

Ah, I see that it is the icon theme! I had my icon theme set to Breeze Dark, while Application theme was set to Breeze. Setting both to Breeze fixes the problem.