We will need your Grid and datasource configuration and a step-by-step guide how to reproduce the described problem on a regular basis.
First of all, please make sure that the Model uses only supported data types. Then check whether the problem is also exhibited with jQuery 1.7.2 or is specific to 1.8.#.
Greetings,
Dimo
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI now!