double-clicking on a MathType equation after an eXtyles process has
been run will open an entirely different equation for editing in Word 2007. The
problem is related to the save to RTF that’s performed “under the hood”
by eXtyles. In some cases (which have not been clearly defined to
Inera), saving a Word document to RTF (even without eXtyles installed)
will cause this problem with MathType equations when the RTF file is
then closed and reopened. To avoid this behavior in Word 2007, run the MathType menu
function Convert Equations on the Whole Document with the type set to
Convert Equations to MathType equations. This should clean out or expose the underlying problem in the equation.
Note that this conversion does not work properly in some versions of
MathType 5.x. It does, however, work in the most recent versions of
MathType 5. Inera recommends any version of MathType 6.5 or later, up to
the most recent release, 6.9.
This problem appears to be specific to Word 2007, and upgrading to Word 2010 may resolve the problem.
A tech note from Design Science (http://www.dessci.com/en/support/mathtype/tsn/tsn113.htm) provides information related to this issue.