MS Word 2007 Equations Not Printing As Seen in Word

I have many equations in an MS Word 2007 document.  (They don't look great in Word because MS no longer uses their much better Equation 3.0.)  When I  combine the MS docs into one PDF, many equatiions print as a single line as if they were somehow being scaled down. 

Is that a known problem? Is there a solution?  I am using Acrobat XI on WIn 7 and Win XP.

Thanks.

-Tom