Hi,
I'm experiencing a weird problem related to RadAjaxManager on a SharePoint 2103 layout page. From time to time (it seems quite random) "ajaxified" buttons (i.e. the ones under control of RadAjaxManager) issue a full postback instead of a partial AJAX request. As a result, values entered on a form (in text boxes, drop-down lists etc) are lost because the entire page is pull out from the server. This is a really bad user experience.
I did my research and it seems that disabling Forms Authentication in IIS of my SharePoint web application fixes the issue. The question is why does it fix the problem and what are the drawbacks of disabling Forms Authentication. I have to explain that to my client.
Thanks,
Leszek