Controls on form disappear
 

I've created a user form with the Microsoft date/time picker control on
it for data input by certain departments in our organization. It
appears that if someone opens this form on a computer that does not
have the DTPicker control installed on their computer, the control
disappears from the form. The next time that form is opened on a
machine that does have the control installed the form is blank and the
controls must be added to the form all over again. I can understand why
the form wouldn't show up if the control isn't installed, but why does
this delete the control from the form
Thanks in advance for any help!