I noticed the following while playing with the markdown bundle. Seems to me like a bug when changing a language that is included in the current language for a document.
1) Open an empty document, write some stuff (including some inline markdown like emphasis) and select markdown as a language. 2) Make changes to the inline markdown language, press format and test. They are not reflected in the text. 3) Opening a new file, copying the text over, and making the language in the new file markdown reflects the changes. The original file still does not show any difference. 4) Changing the language of the original file to LaTeX, and then back to markdown doesn't fix it either. 5) Changing the language of the original file to Inline markdown, and then back to markdown still leaves it bad.
Haris