Form_Timer not running

[sstiebinger]

I'm trying to implement a basic idle timeout based on the MSDN article and I'm having an issue...

My code is as follows:

Private Sub Form_Load()
    Me.TimerInterval = 1000
End Sub


Private Sub Form_Timer()
    Const conIdleMinutes = 10
    Static strPrevForm As String
    Static strPrevControl As String
    Dim strActiveForm As String
    Dim strActiveControl As String
    Dim timExpiredMinutes
    On Error Resume Next
    strActiveForm = Screen.ActiveForm.Name
    strActiveControl = Screen.ActiveControl.Name
    If Err Then
        strActiveForm = "No Active Form"
        Err = 0
    End If
    If strPrevForm = "" Or strPrevControl = "" Or strActiveForm <> strPrevForm Or strActiveControl <> strPrevControl Then
        strPrevControl = strActiveControl
        strPrevForm = strActiveForm
        TempVars!varexpiredtime = 0
    Else
        TempVars!varexpiredtime = TempVars!varexpiredtime + Me.TimerInterval
    End If
    timExpiredMinutes = (TempVars!varexpiredtime / 1000) / 60
    If timExpiredMinutes >= conIdleMinutes Then
        TempVars!varexpiredtime = 0
        DoCmd.OpenForm "frmTimeoutDialog"
    End If
End Sub

I open the form and the timer never runs... checking the values in the immediate window show that the variables are never assigned.
It doesn't even appear that timerinterval is being defined... What am I doing wrong?
I've done it in VBA above, as suggested, as well as tried the form properties.

Access 2016.

[ranman256]

does ...
the ON TIMER event have code in it?
is TIMER INTERVAL set to at least 1000?
does the code in the ON TIMER event function without errors?

[sstiebinger]

Timer interval is set at 1000 (on the form properties AND also setting on form_load in VBA, just in case.)
On Timer is set to [Event Procedure] which, when clicking the elipses generates the Form_Timer() sub, which is filled above.

[sstiebinger]

I put the Form_Timer code in a new sub Test() and ran it... it worked.
So it really seems to be that Form_Timer() simply isn't firing???

[sstiebinger]

I should note... this is on a navigation form... the frmTimeoutDialog form that's called at the end of the sub has a very similar setup but has buttons to cancel the idle timeout.
That form comes up, and 5 minutes later (the timeout I set) that form closes the application.

So is there possibly an issue with running timers on a navigation form?