[AccessD] option click error

Strange things are happening today...

I have a form with a tabcontrol and some subforms on it. If I option (right)
click on an area that shouldn't be allowed to have a specially designated
shortcut menu bar - such as a shape or the background of the detail area
(where there are no controls) on a continuous form, etc. I get an error
which says:
"Microsoft Access can't find the macro 'True'"
bla, bla, bla...

Anyone have any idea why this is happening?

John B.