Hello Mark,
Do you use standard ASP.NET control which inherits from
System.Web.UI.UserControl class or have you created custom web part which inherits from
CMS.PortalControls.CMSAbstractWebPart class?
Are there any logs in the Event log related to this issue (
Site manager -> Administration -> Event log)?
Moreover, which version of Kentico
CMS you are using?
Anyway, postback is not working by default on root of the web site (where there is no specific page accessed) in Kentico CMS because of IIS settings. If you are using IIS 7 or higher, could you please make sure that
httpErrors and
modules section of your
web.config file is set up according to following documentation:
IIS 7 and higherBest regards,
Michal Legen