Flash Builder (ecplise) syntax coloring not working

A few weeks ago syntax coloring stopped working for the开发者_运维百科 odd file. Or halfway down a file. Now its becomming increasingly the norm.

I've cleaned the project, pruned out a whole heap of closed projects, but it hasnt improved things.

What would Stack Overflow suggest?

I ran into this last week. In my case my main application mxml file stopped having it's code highlighted. Also I lost the ability to switch between source and code views for that file. It was as if it was just being recognized as a basic text file.

To get it working again I had to create a new mxml file, made it the default application, copy/paste all my code over into the new file, delete the original file, and then rename my new mxml file to match the file I just deleted. Then i went into my project properties and made sure my Run/Debug settings were still correct so i could launch/test the application again.