Just to be on the safe side, you might want to run a recover on the file and see if the recover operation reports finding and fixing any problems with your file. I'm not suggesting that you use this recovered copy--just to use it as "quickie cat scan" to check for possible file corruption.
I ran a recover on the file and everything came up clean.
Thanks for the suggestion / reminder to check for corruption.
Just happened to me as well. Made a compressed copy of the file and tried to run that copy, same problem. Quit / restart FM and reboot didn't help. Recover only thing that did in fact help.
I take that back.
Problem keeps coming back. Opened other files, problem consistent across all of them, does not seem to be file-specific. No luck with any other workaround so far.