Hi Eric,

> Duh, sorry.  Try this patch instead.

I pushed to Emacs `master` a patch to `track-changes.el` which doesn't
fix any bug but allows it to record more information to help find the
root cause of errors.

If you're able to try Emacs `master` (which would be helpful), then the
patch I sent doesn't apply to it (any more), so please use the patch
below instead and add `(setq track-changes-record-errors 'trace)` to your
init file so as to activate the additional recording.


        Stefan