We have updated Telerik from 2010.3.1109.35 to 2018.1.177.45 and also our Website from .NET 3.5 to .NET 4.7
We now find that our AJAX driven paging on our User Controls is no longer working and it ends up just posting back rather than updating the User Control.
For example, when clicking the Page Right button or jumping to a page the Loading Panel is displayed but then a full page refresh occurs and nothing has updated.