FlashBuilder - Single .as file without custom editor colors

The title pretty much says it all. The entire hierarchy obeys the custom editor colors I’ve set(a dark theme), except for one .as file. It is just plain white on black. Ironically it has kept two of the custom colors, since default is the inverse. But no colors anywhere else in that .as file.
From time to time I will see a paragraph or two pop into color, usually if I’ve just made a change or searched for something in that paragraph, but it doesn’t last long and the rest of the file is still monochrome. Thoughts?
Mac OS 10.68 Intel Core2 duo MBP
Adobe FB 4.5
Flash CS5.5