Thanks for looking at this Pat.
Yes, the cutting objects are exactly the same size. Thanks for the tip on that.
Regarding my file with missing objects: the file itself isn't anything I can't recreate, but I would like to understand what's going on.
The objects were definitely not deleted at the time of saving - in fact I have a series of autosave files with the same issue.
I have recovered (sort of) the Marionette object by importing the design layer into a new file - see attached. Now the problem is that I can select the Marionette object with control-A, but I can't see it.
Any idea what's going on?
Unstrut 6 recovered.vwx