Unfortunately, there's really no additional info in the Log Viewer: ModuleId: 3546 ModuleDefId: 145 FriendlyName: Languages ModuleControlSource: DesktopModules/Admin/Languages/languageeditor.ascx AssemblyVersion: 5.6.0 PortalID: 0 PortalName: Spectracom Web UserID: 1 UserName: host ActiveTabID: 50 ActiveTabName: Languages RawURL: /Admin/Languages/tabid/50/Default.aspx AbsoluteURL: /Default.aspx AbsoluteURLReferrer: UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729; .NET4.0C) DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider ExceptionGUID: 0abce01f-41fc-443b-b530-3b817802a089 InnerException: Object reference not set to an instance of an object. FileName: FileLineNumber: 0 FileColumnNumber: 0 Method: DotNetNuke.Modules.Admin.Languages.LanguageEditor.Page_Load StackTrace: Message: DotNetNuke.Services.Exceptions.ModuleLoadException: 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.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace --- Source: Server Name: WEB-OS3-05 Is there anything I can do to generate additional info on the error?

Having the same problem. Error log below...ended up commenting out this line, 425 in LanguageEditor.ascx.vb and it all works:

'languageLabel.Language = language.Code

We do not have multiple languages enabled on the site.
ModuleControlSource: DesktopModules/Admin/Languages/languageeditor.ascx
AssemblyVersion: 5.6.1
PortalID: 0
PortalName: Rogue Wave Software
UserID: 11
UserName: bmccarthy
ActiveTabID: 47
ActiveTabName: Languages
RawURL: /admin/languages/tabid/47/ctl/editor/mid/365/locale/en-us/mode/portal/default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www1.roguewave.com/admin/languages/tabid/47/default.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 Safari/534.13
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 1269767c-92ab-433a-8f6c-fc4dd326b884
InnerException: Object reference not set to an instance of an object.
FileName: C:\Inetpub\vhosts\roguewave.com\httpdocs\DesktopModules\Admin\Languages\LanguageEditor.ascx.vb
FileLineNumber: 425
FileColumnNumber: 21
Method: DotNetNuke.Modules.Admin.Languages.LanguageEditor.Page_Load
StackTrace: 
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: 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.Page_Load(Object sender, EventArgs e) in C:\Inetpub\vhosts\roguewave.com\httpdocs\DesktopModules\Admin\Languages\LanguageEditor.ascx.vb:line 425 --- End of inner exception stack trace ---

Is this still an issue in 5.6.1? I'm getting nowhere with language editor. No files to edit.
Can you elaborate on the exact syntax for the fix you refer to?