How to fix Final Cut Pro X's "Modified File" message Final Cut Pro (FCP) X 10.2.3 today gave me the most unhelpful warning message in my timeline: "Modified File" - thanks Final Cut Pro! What can I do to fix this problem?

I've tried relinking the clips, Googling just lead to more questions and no solutions. Anyone have a clue?
Found a solution to this.

In FCPX go to File -> Delete Generated Event Files -> Delete optimized media = Voila! 

That worked for me instantly. Hope you guys find it helpful too.