Hi,
Do you use
extensionless URLs? If so, could you please try to disable this functionality?
Could you please let me know where exactly are you using the custom code (custom web part etc.)?
Are there any other AJAX controls on the page?
There is one thing you could give a try. You could create a
custom web part which would contain only the code without
asp:UpdatePanel control;
<asp:Timer ID="tmrCountDown" runat="server" Interval="1000" OnTick="tmrCountDown_Tick" />
<span style="font-weight:bold; font-size:1.1em;">
<asp:Label ID="lblCountdown" runat="server" Text="30" /></span>
Than you could try to set the
Use update panel property of the custom web part to
true.
Best regards,
Michal Legen