Hey Richard.. I've added the combo box to the form, it was working great than stopped, I'm uncertain why. I looked under form properties and made certain source was set to my Table and not SQL, it is. I tried replacing the combo box a few times, it worked for a short period of time when inside the form and not the header, now it doesn't work with either the header or form, any thoughts?

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Reply from Alex Hedley:

Is the control bound to anything.
Is there still an event attached to the combo? Or are you doing it with a button.