Today, I opened a .docx from one of my math students, and this error popped up. I don't recall seeing it before, and a Google search only turned up one hit, which was someone referring to the same message. That post was dated October 26, 2014. I am running a MacBook on Yosemite 10.10.1, and I'm wondering whether a recent upgrade in Yosemite, in Pages, or in Micro$oft Office ruined this. I doubt that it's Pages, because OpenOffice 4 can't open the page correctly on my computer, either. Has this happened to anyone else? Can anyone else reproduce the same error?