(same reply as in the ticket)
I cannot be sure what is happening without looking at the code, but I
can give you some suggestions based on your description. ViewState
problems are especially tricky to track down, so it would be best if
you can send us a sample page.
You should check if RadAjaxManager is set up to update all of the
controls that are affected in the AjaxRequest method, for example:
| <telerik:AjaxUpdatedControl ControlID="RadScheduler1" />
| <telerik:AjaxUpdatedControl ControlID="Calendar1" />
The AjaxUpdate method is called late in the page life-cycle, so
RadScheduler might need a call to Rebind() to clear it's internal state
after you set its properties to their new values.
Turning off the ViewState of the controls, one by one, might also help you track down the problem to a particular control.
All the best,
the Telerik team