I would suggest that you report this problem to your local reseller.
I had a similar problem: I could not open the files belonging to Chapter 07 even outside of ArchiCAD. I don't know the cause, but it is strange.
Just to let you know you are not the only one with this problem.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
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