Linked files in headers stored as building blocks

[Robin]

Hi -

I have a linked image in my document header. I select this header and create
a building block from it. I can see the list of linked files in the Links
dialog (accessed from Prepare > Edit Links to Files) and it lists this image
file as linked. I now change the source of the link to point to a different
file (from within the Links dialog). I press Update Now or OK expecting to
see the new image in the header, but Word crashes? Tried this several times
.... any suggestions?

Thanks
Robin