Thanks for the tip! I had this happen to me (about the fourth file it has happened on) once again this morning, but I long ago resolved myself the the fact that I had to live with it (at a lower productivity rate when working with that file) as I had tried most things I could think of (even deleting the file in Flex Builder and creating a new file with the same name didn't fix the issue).
Your workaround worked perfectly first time, thanks again.
