I would go into the form's design view and right click the show password and go to build event and verify that something didn't happen to the code.

Private Sub ShowPWBtn_Click()

    ' show/hide pw
    
    If PasswordTxt.InputMask = "Password" Then
        PasswordTxt.InputMask = ""
        ShowPWBtn.Caption = "Hide"
    Else
        PasswordTxt.InputMask = "Password"
        ShowPWBtn.Caption = "Show"
    End If

End Sub

Hmm, odd, maybe check the form's click event or the Detail click event to make sure there is nothing there or also the mousedown and mouseup events for all of those (including the button).

You could also do a search in the VB Editor for "Quit" and in the "Search" group, select "Current Project" and look to see if anywhere in your project there is code to shut down the application and if there is any way that it is getting tripped.

Beyond that, set break points in the VBE in that procedure to see what it gets to before shutting down.

I added this to update the date field. Private Sub Form_BeforeUpdate(Cancel As Integer)

          LastChanged = Now()
          
End Sub
I remed it out and the show button works

That's odd. I added that to the Download version and not having any problems. Have you tried the routine troubleshooting: Debug/Compile, Compact/Repair, etc. Maybe form is corrupted somehow, as unlikely as that seems.