MathType formulas shrink after editing and saving them in Microsoft Word

One teacher had an issue in MathType that involved saved formulas in a Word doc shrinking after editing and saving them again (even if the edit involved no actual changes).

The weird thing is that we tried with another user on the same machine with the same document and couldn't replicate the behavior, so it seemed to be tied to the user profile, but then later, with a fresh user profile, the issue still seemed to persist. So maybe that was a weird anomaly (it not shrinking)?

I did a bit more digging and Googling and came across this answer from WIRIS:

This is an issue with Retina displays, so that's one possible workaround: if you have a non-Retina display, use that when inserting or editing equations. The equations will be fine if merely viewed or printed when using a Retina display, but when you insert or edit one is when the sizing issue happens.

As Charles suggested in an earlier reply, "Consider reverting to Version 16.15." This is, in fact, Microsoft's recommendation as well. The answer on an earlier question in the Microsoft Community answers forum describes how to do that.

"[F]ine if merely viewed or printed" means, as far as I can tell, if you have already existing formulas that haven't been edited.

We tried reverting to 16.15, and that seemed to fix the issue.

For Munki users trying to downgrade Word to address this particular MathType issue, this is what worked for us:

  • Import Word 2016 (version 16.15).
  • Get the installs array of the binary at /Applications/Microsoft Word/Contents/MacOS/Microsoft Word, and put that in the pkginfo.
  • Modify the pkginfo to also change the version to be higher than 16.16. For us, 16.16.18091015 was sufficient for the change to take hold.
  • Create a new catalog called mathtype, and make that the only catalog for this pkginfo.
  • Put in a preinstall_script that checks for the existence of /Applications/Microsoft Word, and deletes it if necessary. If you don't do this, Munki will install 16.15, but it won't actually replace 16.16.
  • Add the mathtype catalog to the relevant manifest(s) you want to have this downgraded version of Word. Put this catalog before production, testing, or any of the other regular catalogs you have (more details on why).

Example of the preinstall_script:


# Doesn't work if the newer version is already there, so delete it

if [[ -a "$existing_word" ]]; then

/bin/rm "$existing_word"


This downgrade procedure is modeled after the general approach to downgrading via Munki, outlined on the wiki.

P.S. The shrinking MathType formula problem persists in Word 16.17 (Word 2019).

MathType, Microsoft Office, and Munki

Joshua D. Miller has a great walkthrough on how to deploy MathType using Munki.

Just something to keep in mind—MathType works fine in El Capitan... just not with Microsoft Office 2016 (you will not be able to edit formulas, at least as of the writing of this blog post), so if you use MathType, stay with Microsoft Office 2011.

12 March, 2018 Update: I've been getting mixed results on this since having originally posted this up. Someone else on the Mac Admins Slack contacted Design Science recently asking about silent activations on the Mac and was just pointed back to that same archived blog post, even though it doesn't always work.