After spending quite a bit of time on a CSS error, I finally found the error. I mispelled the word chromeColor as chomeColor in my CSS style sheet.. The compiler gives no error or warning on mispelled CSS properties -- e.g. add a style called bogusStyle, and there is no warning or error.
I'm not sure if this is intentional, but it seems like a definite deficiency to me in an otherwise very good bug-catching IDE.
Thanks for considering and making this an ever better product.
Can you please file an enhancement request at https://bugs.adobe.com/flex/ ?
If you prefer a less formal approach: http://ideas.adobe.com/ct/ct_list.bix?c=CF7001C7-AE88-4DE0-A46C-C6C2C2892858 is also a good place.
Sounds good Anirudh, I filed a bug/enhancement with the first link.