Michael,
You didn't include your declaration(s), but I assume:
Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent
As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long

I suppose you have a Kill Timer also:
Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent
As Long) As Long

Not sure, but as you are not specifying a hwnd for the Timer, it has no
connection with the Excel app.

Also, did you try the code without the .Activate/.Select ? e.g.
With ThisWorkbook.Sheets("Sheet1").Range("B5").
.Value = .Value + 1
End With

However, Karl has a Timer class you may want to try:
http://vb.mvps.org/samples/project.asp?id=TimerObj

NickHK

"Michael" wrote in message
...
I have the following code

Public TimerID1 As Long
Public TimerSeconds1 As Single

Sub StartTimer()
' Run the timer procedure every second
TimerSeconds1 = 1 ' how often to "pop" the timer.
TimerID1 = SetTimer(0&, 0&, TimerSeconds1 * 1000&, AddressOf
TimerProc1)
End Sub

Sub TimerProc1(ByVal HWnd As Long, ByVal uMsg As Long, _
ByVal nIDEvent As Long, ByVal dwTimer As Long)

Call CountUp

End Sub

Sub CountUp()

ThisWorkbook.Sheets("Sheet1").Activate

Range("B5").Select
Selection.Value = Selection.Value + 1

End Sub

While the code runs if I try to bring any modal dialog (E.g. File --
Saves
As or attempt to refresh a PivotTable on the same workseet), Excel
crashes!

What I want to do is to execute some code to kill any modal dialogs before
I
execute the code inside the StartTime sub. Any sample code for this?

Thanks in advance
Michael