Invalid viewstate exception with RadComboBox

[Paul]

Hi All,

I'm troubleshooting an issue with RadComboBox where I'm getting this exception:

"Invalid viewstate. \r\n\tClient IP: 192.168.1.107\r\n\tPort: 1603\r\n\tUser-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648)\r\n\tViewState: /wEWNQLUvuKlDwKanLyKDwL+vra0BwL+vubYBAL+vsqFDQL+vt7iBQKFnPyJDwKEnLyKDwKBnLyKDwKdnLyKDwKAnLyKDwKHnLyKDwKFnLyKDwKDnLyKDwKSnLyKDwKFnMyJDwKFnPCJDwKFnMiJDwKFnPSJDwKFnNiJDwKFnMCJDwKFnMSJDwKFnJyKDwLHsJBxAuLLl7oKAsCamcIOAuX08/QFApjSvc0LAoXAk6QFAprG7pELAozb8oILAruBkaMHAqHOw/oJAoCJ6fgLAsOomOQEAvn6044JApTk8aMDAqLW/roBAq6jnpcMAu7npfgIAontjqwGAoPG8ocFArXlpuQFAuvtnK4BAuOjjs0CAo2H6PsDAom4wI8EAoKLyOcIAoyulcwNApvHucUNApDzsokDAvCC478BAoT4/4AMd7qpJsHELlrQcakKn3xW9aOMYBM=\r\n\tReferer: http://link removed\r\n\tPath: "

This happens when any postback button on the page is clicked while the type-ahead feature of the RadComboBox is looking 

for a match and the progress panel is displayed.  

Now, this only happens when AutoPostback property is enabled on the RadComboBox but I'm using this feature

to catch the SelectedIndexChanged event to populate another RadComboBox with default value.

Any idea how this could be rectified without disabling AutoPostback?

[Simon]

Hello Paul,

I tried reproducing this issue with Telerik.Web.UI v2008.3.1125 without success.

Could you please confirm the version of Telerik.Web.UI that you are using?

Regards,
Simon