ID CS6 Windows: weird bug. Objects vanishing

Question

All my users have Windows 8.1, InDesign CS6 (8.0.2).
One user has a problem which has occurred on several documents, as follows:
1. The document is just fine on her computer
2. On everybody else's, some objects (it's a book cover -- all the elements on the back) are not visible. You can't see the frame outlines, and you can't see the content, but when the mouse hovers over them they are highlighted and can be selected and edited -- you just can't see or print them!
At some zoom levels (very small) they reappear, and sometimes you get a glimpse of them, but they vanish again when clicked on.
I have tried saving to IDML and get exactly the same behaviour.
The objects include text frames and simple boxes.
Does anybody have any idea what is going on here?
Thanks,
Ivan (happy to throw an IDML file at someone who knows what they are looking at!)

Answer 1

You are seeing exactly what I would expect (I pulled the back cover image back to the right, and changed the colours of the box as experiments, before making the IDML) -- which is NOT was I am seeing.
The reason I mentioned the blue outlines is that I am seeing some of them but not all of them: in any program I have ever seen they are either all on or all off.
After lots of troubleshooting, I THINK have have a resolution, if not a reason.
The top box on the back (In the CITY OF FATE) is in Adobe Caslon Pro.
If I delete this on its own, everything else goes back to normal. If I cut-and-paste this box in from an older version of the document, everything freaks out again. If I change the font in the older version THEN cut-and-paste it, everything works!
So this document appears to have an issue with Adobe Caslon Pro, which is inherited if this box is cut-and-pasted into other documents: my staffer is out-of-house, so I'll have to check that her Suitcase is using the same version of this font as me (which it should be) and take it from there.
How very, very strange.
Thanks for your help.
Ivan