To Telerik and anyone else who has similar problems:
If the site behaves differently on a development server and the deployment server, it is because Microsoft introduced different rendering methods for local and internet servers.. for reasons I cannot comprehend.
here) do not work.
To fix the probem, add this to the <head> section of your ASPX file:
<meta http-equiv="X-UA-Compatible" content="IE=Edge"/>
This changes the compliancy mode of IE.
More information here: