I would like to inform you that we are aware of similar issue that happens when adding items to the source collection of RadDataBoundListBox when the control is unloaded, i.e. when you have navigated to a page different from the one that has the listbox. We will provide a fix for this issue in Q1 2012 SP1 and also will release an Internal Build containing this fix soon.
Could you please confirm that the scenario mentioned above is the one that causes the issue on your side? If you think this is not the case, it will be great if you manage to reproduce the issue in a separate WP project and send it to us for further investigation.
Please note that you will have to open a new support ticket in order to be able to attach your project.
the Telerik team
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