"Our architectural model has a linked structural model whose path is set to relative. Its reference type is overlay.
The structural consultant updates their model every week and it is sent to us through our ftp site / dropbox. "

When we reload the structural model, we do not see the latest structural (there seems to be no change to the older model).
Removing the link and re linking fixes the problem but I don't see that as a solution.

I have checked that the structural model indeed has changed significantly since last upload... but those changes are not showing up in our model.

Have you heard of this kind of problem faced by any of your users? I have tried looking it up on blogs but did not find any solution.
Please reply if you have a quick solution. Is there anything we are missing? A version difference?