I get the following error when I attempt to enter the desktop modules node when editting resources files through the languages section

AssemblyVersion: 5.6.2
PortalID: 0
PortalName: Commercial Catering Spares Limited
UserID: 1710
UserName: pma
ActiveTabID: 47
ActiveTabName: Languages
RawURL: /Default.aspx?tabid=47&ctl=Editor&mid=365&locale=en-GB&mode=Portal
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.ccspares.co.uk/Default.aspx?tabid=47&ctl=Editor&mid=365&locale=en-GB&mode=Portal
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 4e17f542-b005-4158-92be-d8d94d7e0e05
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Admin.Languages.LanguageEditor.get_SelectedResourceFile
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.at DotNetNuke.Modules.Admin.Languages.LanguageEditor.get_SelectedResourceFile()at DotNetNuke.Modules.Admin.Languages.LanguageEditor.ResourceFile(String language, String mode)at DotNetNuke.Modules.Admin.Languages.LanguageEditor.LoadFile(String mode, String type)at DotNetNuke.Modules.Admin.Languages.LanguageEditor.BindGrid(Boolean reBind)at DotNetNuke.Modules.Admin.Languages.LanguageEditor.resourcesGrid_NeedDataSource(Object source, GridNeedDataSourceEventArgs e)at Telerik.Web.UI.RadGrid.OnNeedDataSource(GridNeedDataSourceEventArgs e)at Telerik.Web.UI.RadGrid.ObtainDataSource(GridRebindReason rebindReason, Boolean IsBoundUsingDataSourceId)at Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason)at Telerik.Web.UI.RadGrid.OnLoad(EventArgs e)at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Control.LoadRecursive()at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)--- End of inner exception stack trace ---
Source:
Server Name: WIN-8086CQNAQ6C

Thanks, I had the same problem and this fixed my issue too.  I have reproduced it in 5.6.2 and 6.0.0.  As, this page uses Ajax, this must be what is meant by "** Warning: Memory page state persistence can cause Ajax issues **" in the Performance Settings area of the Host Settings.

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