I did not look to see the code but this only happened with one server when trying to look at the settings in the main tcadmin panel on the host server.
This error was raised when opening a server in ~/Interface/Base/EditServer.aspx
Happened after updating to 2.0.51.0
System.ArgumentOutOfRangeException: Selection out of range
Parameter name: value
at Telerik.Web.UI.RadComboBox.PerformDataBinding (IEnumerable dataSource) [0x00000] in <filename unknown>:0
at Telerik.Web.UI.RadComboBox.OnDataSourceViewSelectCallback (IEnumerable data) [0x00000] in <filename unknown>:0
at System.Web.UI.DataSourceView.Select (System.Web.UI.DataSourceSelectArguments selectArgs, System.Web.UI.DataSourceViewSelectCallback callBack) [0x00000] in <filename unknown>:0
at Telerik.Web.UI.RadComboBox.OnDataBinding (System.EventArgs e) [0x00000] in <filename unknown>:0
at Telerik.Web.UI.RadComboBox.PerformSelect () [0x00000] in <filename unknown>:0
at System.Web.UI.WebControls.BaseDataBoundControl.DataBind () [0x00000] in <filename unknown>:0
at Telerik.Web.UI.RadComboBox.DataBind () [0x00000] in <filename unknown>:0
at Web.Base.AdvancedDropDownList.SetDataSource (System.Object o) [0x00000] in <filename unknown>:0
at Web.Base.ServerSelection.SetDataSource (System.Object o) [0x00000] in <filename unknown>:0
at Web.GameHosting.ServerDetails.ServersFastDownload_NeedDataSource (System.Object sender, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e) [0x00000] in <filename unknown>:0
at Web.Base.ServerSelection.xe461db79a2cc16ce (Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs xfbf34718e704c6bc) [0x00000] in <filename unknown>:0
at Web.Base.ServerSelection.AdvancedDropDownList1_NeedAutoDataSource (System.Object sender) [0x00000] in <filename unknown>:0
at Web.Base.AdvancedDropDownList.Page_Load (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0
at (wrapper delegate-invoke) <Module>:invoke_void__this___object_EventArgs (object,System.EventArgs)
at System.Web.UI.Control.OnLoad (System.EventArgs e) [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Control.LoadRecursive () [0x00000] in <filename unknown>:0
at System.Web.UI.Page.ProcessLoad () [0x00000] in <filename unknown>:0
at System.Web.UI.Page.ProcessPostData () [0x00000] in <filename unknown>:0
at System.Web.UI.Page.InternalProcessRequest () [0x00000] in <filename unknown>:0
at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000] in <filename unknown>:0