Thank you for your post.
Please send in the file from Mac OS X 10.10 so we can compare the differences when opening it with Mac OS X 10.10 and Mac OS X 10.10.1. Do not send in a file from the 10.10.1 pre-release, as this should not be used for production. Check your Inbox at the top of this page for instructions where to send the file.
I have just 1 FM-Solution I'm working on and it's a 380MB! Though negative on sending in 'the file'.
I did a backup-retrive and it figured out, that the issue appears on different layouts(!!) as on the other file and the damage in retrieved file is much smaller.
I'm sure someone else will trap into same issue and maybe can send in a small file.