Hi Dave,
Indeed the version that you mentioned is very old one and it is likely that some of the features do not work in some browsers. Unfortunately my best suggestion would be to upgrade to any of our later versions that support the latest browsers. Please take a look at the following post that provide more detailed information on our support
lifecycle policy.
Regards,
Kate
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their
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