TechNote #164: 
Last modified:
08/14/2017 
When using Toggle TeX, sometimes inline equations become display equations
The information in this document applies to:
 MathType for Windows
 MathType for Mac

 Microsoft Word
except Word 2008 or 2016 for Mac

Issue
You're working with a Microsoft Word document. There are MathType equations
in the document, but you want to edit them with TeX, rather than doubleclick to
open them in MathType. You use the shortcut key Alt+\, make your edits to the
TeX, and use Alt+\ to "toggle" them back to MathType equations. When you do
that, you notice that some of the inline equations are now display equations.
Reason
MathType has a setting named "Inline Equation", which is
either on or off. This setting is in MathType's Format menu. Setting the value
of "Inline Equation" correctly depends on inserting the equations correctly. If
you copy and paste an equation from MathType, MathType will of course not know
where you will paste it into your document. Therefore, the value of "Inline
Equation" will be whatever you manually set it to be in the Format menu. If you
are copying an equation from one place in the document to paste into another,
note that we do not recommend copying and pasting equations this way,
but the value of "Inline Equation" will be whatever it was in the equation you
copied.
Properly setting the "Inline Equation" property
This value will always be set correctly if you use any of these
buttons on the MathType tab in Word:

Insert Equations buttons in Word for Windows. Similar commands
in Word 2011 for Mac. 
If you insert equations into Word using these commands and subsequently
toggle the equations to TeX, inline equations will remain inline equations and
display equations will remain display equations when you toggle back to
MathType. If you prefer to copy & paste from MathType into Word, be sure to
verify the setting of "Inline Equation" in MathType's Format menu before you
copy the equation.
We hope this has been helpful. As always, please
let us know if you
have questions about this, or if you have additional techniques that work. We'd love to hear from you.
