Mac Yosemite saving/opening problem


I am an Animation teacher at a High School here in Hawaii and have come across this problem.

Students have been saving and opening files and have come across error messages which state that animation layer items will be replaced. Then upon trying to open the files it states that colors cannot be found and a color recovery needs to be done. Then at that point layer items are missing (such as right arm, head etc.).

We recently upgraded to Yosemite on our iMacs. Has anyone ever come across this problem and is there some type of fix? Attached are pictures of what we are experiencing.

Any help will be greatly appreciated.

Thanks much!
Garrett Omoto