Protect Worksheets With UserInterFaceOnly On Mac

I have used for some time the technique of having the worksheets protected and the (through buttons) call macros that Applicatition.Unprotect the sheet do something not allowed while sheet protected and then Application.Protect. They work. Then I read about UserInterfaceOnly and I wanted to use it. I tried unsuccessfully a sort of testing

Private Sub Workbook_Open()
Dim wSheet As Worksheet
For Each wSheet In Worksheets
wSheet.Protect "aPass", UserInterfaceOnly:=True
Next wSheet
End Sub

Code for three buttons on the same sheet. Very simple code to try whether previous code behaves as expected.

Sub FillValueActive()
Dim activeNum As Integer
activeNum = ActiveCell.Row
Range("A1").Offset(activeNum - 1, 0).Value = "This text shows filled"
End Sub .........................................