This has happened in the past, but I can't remember the solution. A Mac OS upgrade completely messes up the line spacing inside Flash documents, requiring potentially a hundred hours re-setting all of my past documents. A very simple example can be seen below. You're looking at two different text objects inside a symbol. The giant space that exists wasn't there previously. Its much worse when working with multiple text objects because I'd have to replace all of them to get the same layout I had before. Really need an easy fix to this because I don't have the crazy amount of time required to fix all of these instances by hand.