Special Characters - System Error Bug

UsbCable

Link to test case:
Debugger code (debug.datatables.net):
Error messages shown:
Description of problem:

Below, I edit datatable cell and add a degree symbol °

when I click back to make more changes, on the Client side converts it to HTML code

then when I make changes to it I get this "A System error has occurred" error. This is the issue I am trying to resolve. I would also appreciate any help as to how I can prevent it from converting the degree symbol to HTML code as well.

Below is headers and preview of request

The backend is done in ASP.NET MVC 4

Any help would be appreciated thanks !

colin

Is this using Editor? We're happy to take a look, but as per the forum rules, please link to a test case - a test case that replicates the issue will ensure you'll get a quick and accurate response. Information on how to create a test case (if you aren't able to link to the page you are working on) is available here.

Cheers,

Colin