Let's see if I understand your problem -- you cannot see equations when you add them to a document using the journal template, but when you use Word without a template you can see the equations. Is this correct?
I'm not sure what the problem could be. MathType 6.7 definitely works in 64-bit Windows 7; in fact, that's the environment in which I use it. I opened both your document and the journal template, and could see equations in both. For example, in the template there is an equation in paragraph 3.3.
Can you re-state your problem and give more details? Also, what version of Word are you using?