https://www.dotnetzone.gr:443/cs/blogs/rousso/archive/2006/12/02/21568.aspxOk! Here is a new thing I discovered yet again the hard way... In short: Do not call Page.ClientScript.RegisterOnSubmitStatement after the Page Load event. (What?!) Well yes! It's not under all circumstances that you can notice the difference but it'selCommunityServer 2.1 SP3 (Build: 20423.1)