Ok, I have a module that displays a dynamic calendar with next/prev links. I'm using Telerik's Rad Ajax. On my local 4.8.2 it works fine. When I install it on a prod server running the same version of DNN it generates the following error when I click prev or next.

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

If I go into the module settings and check the "Supports partial rendering" it then works without error. But on my local install that is not checked for my module. And again I'm using the RAD Ajax component so I didn't think I needed to use the "Supports partial renderging" box.

Any ideas? Thanks.

I had a similar issue after I upgraded to 4.8.2 (when using a Rad Ajax / Multi-Page / Tabstrip / Gridview set of controls) - I got the same error (he Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). - when switching indexes in the TabStrip.

Your suggestion of checking the "Supports partial page rendering" did the trick for me - and the error went away.

I didn't think I needed that, because in my code behind I would always put in the following in the Page Load. 

If DotNetNuke.Framework.AJAX.IsInstalled Then
                    DotNetNuke.Framework.AJAX.RegisterScriptManager()
End If

However - after I examined my code - I see I forgot it on this control (must be why it broke after the upgrade).  I went back and put it in the Page Load, unchecked the "Supports Partial Page Rendering" in module definitions - and it worked.  (I am presuming that the Ajax fix for 4.8.2 had something to do with this one).