Compressing a design file v8i Ss6

I am running through all our project design files and compressing them. I am having an issue with the odd file where abd crashes and I get the System Fault bad memory error.

On this particular file I have detached all the reference files and then reopened the file. I have noticed in the message bar and the bar at the bottom left files are being loaded that are no longer attached. Is this the standard behaviour of abd?