[OS X TeX] Disaster

[George Gratzer]

I work on two computers, an iMac with El Capitan and a MacBook Air with Yosemite. Both have TeXShop 3.52.

I’m working on the second edition of my congruence book (which lives in Dropbox) and all of a sudden
neither machine can typeset it properly.

On my iMac, the TOC is completely wrong, see attachment. Part II is repeated as part of Part I.


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On the  MacBook Air, the book does not typeset: \TextOrMath is an undefined command.

Trouble.

GG