Post the code.
Here's an alterntive to Mini and Maximize
On the main form button that opens the next form put...
Me.Visible=False
INSTEAD of DoCmd.Minimize
Again, put it BEFORE the OpenForm line.
On the OnClick Event of the button that closes the second form, simply put.....
Docmd.OpenForm "FirstFormName"
Or better still put it on the Form's OnClose event in case a user closes with the built in 'Close' on the form (the'X', top right)
Looks neater having it 'invisible' rather than minimized