This may help some.
The document I was working on I opened up in Word for Windows, compressed the pictures, which reduced the file size from 74 megs down to 5.5 megs. Opened it back up on the Mac and everything was working fine. (I needed to make to two photographs semi transparent then superimpose them on each other, which you can do in the Mac version and not the Windows version). Added one more photograph, and it started acting up again.
This time I started getting the errors that appeared the first time I worked with a very large file. I can’t recall the exact language of the errors but they were essentially, the disk is full or corrupted, try saving the file under I new file name. If you try to do this, you were then presented with an error that you could not save the file because the process was in use. If you saved it a second time, you got an error you were using an invalid file name, the file save as screen would go blank, but it would save (under the new name). Finally at this point Word would crash.
After the file was saved the file size went from 5.5 megs to 68 megs in size. I had only added one more photograph.
Can’t say for sure what the error is, but it is clearly related to the high resolution photographs in the document. For whatever reason, Word is not handling the images correctly and it is causing it to produce all kinds of errors. I suspect, if I were to open this file back up, it will crash my hard drive again, not worth the effort, since I have made the changes I needed to make in the Mac version and can go back to the Windows version.
I ran the disk utility immediately after this occurred and it verified fine and there was no errors.
Not meaning to ramble, but hopefully, this will help some who have had similar problems or avoid them all together.
Greg