Another file in the project — not #include'd in this file — #define's a macro called Trace(). In my class, the declaration of Trace() is coloured as a macro not a function.
The coloring logic needs serious enhancement when it comes to dealing with an identifier defined in more than one "category" (class, macro, variable, method, etc.) The existing logic apparently was originally designed assuming identifiers are not used simultaneously for different "categories" of things, so it appears to use the first category it finds the identifier defined in, with no regard to context.
I've made many requests about this, and they should be getting to it in March.