Changes to MXML fail to compile
 

I imported a flex archive file but when Changes to MXML file they fail to compile when I run the application. The old version of the swf is run in the flash player.

Strange

Upon further examination it appears it is only building 1 of my projects I was working on in the past and not the one that file is currently open in the Flex builder window. How to get it to build the current project I'm working on?

I'm also not getting syntax highlighting as I type even though build automatically is ticked.

I only get syntax highlighting when I run 1 of my projects I was working on in the past after I run any project

I even have this problem if all unrelated projects are closed.

I fixed it

I imported the archive file into FLEX but there is a library include in the build settings about a folder called libs which does not exist in the project files. After I removed that library path I could build my project.