Hi, Laura,
Word considers ActiveX controls to be in the same class as macros (that is,
as security threats). If you have your macro security level set to High,
both macros and ActiveX controls are unconditionally disabled, and that's
what causes the document to open in Design Mode.
You can set your security level to Medium (Tools > Macros > Security) and,
each time you open the document, click the Enable button in the warning box.
Setting the level to Low is "not recommended" for obvious reasons. Every
person to whom you send the document will also have to set their security
level to Medium and click Enable -- and unless they know what I've just told
you, you're going to have to tell them.
There are two alternatives, neither of them very appealing.
One is to use check boxes from the Forms toolbar, but that requires you to
protect the document for forms (Tools > Protect Document) -- and that means
nothing outside the check boxes can be edited, plus a number of other
features don't work.
The other is to use the combination of AutoText, macros, and MacroButton
fields used in the Fax templates that come with Word. Not only do these have
the same drawback of not operating if the security level is High, but they
also mean you have to send the template along with (or instead of) the
document because AutoText can't be stored in a document.
With the release of Office 2003 there's a third alternative, the new program
called InfoPath, but that requires every recipient of the form to have a
copy of InfoPath. Unless they're all in your company and have all been
upgraded, that's a nonstarter.