Combobox not working after being modified by a macro

[S Oberlander]

I have an excel sheet with a combobox and checkbox
the checkbox is set to invoke the combobox and vice versa

somehow after the checkbox is clicked and the combobox value changes thru vba, the combobox stops working
if I click on the combobox, instead of giving me the dropdown selection, the image of the combox momentarily appears duplicated right next to it

see code below, is there any way to fix this?

Private Sub iqmpchck_Click()
If iqmpchck.Value = False Then
 ComboBox1.Value = "OFF"
Else
 ComboBox1.Value = "Sample"
End If
End Sub

Private Sub ComboBox1_Change()

Dim newval As Range
Set newval = Sheets("Sheet2").Range("B1")

Select Case ComboBox1.Value
Case "Sample"
'things happen
Case "example "
 'things happen
End Select

If newval = "OFF" Then
    iqmpchck.Value = False
End If
End Sub

 

[Jeffrey Mahoney]

I duplicated your controls and code. No issues. Do you have any other controls on that sheet? Do you have any hidden objects on that sheet? (Home > Find & Select > Selection Pane)

 

[S Oberlander]

I put my workbook into design mode, moved the combox to a different place on the sheet and now its working properly.
Do I just chalk this up to one of excel's unexplainable errors?

 

[Jeffrey Mahoney]

It is still a strong possibility that you had two controls in the same space. If not so, then yes (cue the X files theme song)