I have the same issue on my 2011 Macbook Pro. I am also running 10.9.5
My Quicktime is up to date and working just fine. I am not sure what the real problem is.
I read that this could be a permissions issue so I repaired permissions and that didn't help. I also read that it could be related to Blue Stacks but I removed that a while ago (found it useless). I ran a removal application again just in case but that didn't help either.
I am really stuck now.... I posted a similar thread here..... still waiting to hear from an "Adobe Expert". Nothing so far.