I have a RadAjaxLoadingPanel and RadAjaxPanel on a page which has a RadToggleButton using FontAwesome in the ButtonToggleStates. This has been working perfectly, but have recently needed to add a RadScriptBlock inside the RadAjaxPanel. Everything appears to be working correctly with the icons in the ButtonToggleStates loading correctly. The problem occurs when you select the RadToggleButton and the icons stop loading. Any one have any ideas why this might be occurring?