I would start by making the changes in RED and see what you get.
Code:
Private Sub Form_Load()
'On Load of the switchboard check Jobs table for any uncompleted jobs
Dim intStore As Integer
'Count of uncomplete jobs that are past the Expected Completion Date
' intStore = DCount("[JobID]", "[tblJobs]", "[Finish Date] <=Now() AND [Paid?] =0")
intStore = DCount("[JobID]", "[tblJobs]", "[Paid?] = False")
'If count of uncomplete jobs is zero display switchboard
'Else display message box detailing amount of jobs
'and give the user the option as to whether to view these or not.
If intStore <> 0 Then
If MsgBox("There are " & intStore & " incomplete jobs." & _
vbCrLf & vbCrLf & "Would you like to see these now?", _
vbYesNo, "There are incomplete jobs...") = vbYes Then
DoCmd.Minimize
DoCmd.OpenForm "frmReminders", acNormal
End If
End If
End Sub
Notice that I eliminated the Exit Sub's.