I'm currently using Forms and Lists latest build that comes as default with DotNetNuke 5.5.1 release. While building a simple HR form i noticed a problem. Looks like form is not displayed regardless of permissions set on module level. It simply gives following error.
Object reference not set to an instance of an object.

Investigating Log viewer:

AssemblyVersion: 5.5.1
PortalID: 0
PortalName: İleri Pompa Sistemleri
UserID: -1
UserName:
ActiveTabID: 67
ActiveTabName: İnsan Kaynakları
RawURL: /insan-kaynaklari/tabid/67/language/tr-TR/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.ileripompa.com/anasayfa/tabid/40/language/tr-TR/Default.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.44 Safari/534.7
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: edf6eda4-0aa0-405e-8904-deec4aa3d3a7
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.UserDefinedTable.Security.ModuleSecurity.HasAddPermissonByQuota
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.UserDefinedTable.Security.ModuleSecurity.HasAddPermissonByQuota(DataTable FieldsTable, DataTable DataTable, Int32 userRecordQuota, String username) at DotNetNuke.Modules.UserDefinedTable.EditForm.CheckPermission(Boolean isUsersOwnItem) at DotNetNuke.Modules.UserDefinedTable.EditForm.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source: -

I thought maybe SQL Data Provider files haven't executed by system so i tried to execute them manually by order. It didn't help to. FYI information i am using my website with Turkish and En-US interfaces.

Although it does not work with unauthenticated users, while logged in as host no problem so far. I haven't tested it with Registered Users group yet.

Seb, Stefan.. Do you have any idea?

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Or-Rouge Team Or-Rouge
Personally recommend Hostgator for hosting single or multiple DotNetNuke Websites.
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Btw - I'm going to test Registered Users group as well. Thanks for the quick response.

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Or-Rouge Team Or-Rouge
Personally recommend Hostgator for hosting single or multiple DotNetNuke Websites.
DotNetNuke Tips and Tutorials
Install DotNetNuke to Godaddy root
DotNetNuke Türkçe Hakkinda Hersey

I was able to test Registered Users scenario a few hours ago and looks like it only affects Unauthenticated Users. For debugging; i would follow your suggestions or, i could assign you FTP access (or/and RDP access) on this installation.

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Or-Rouge Team Or-Rouge
Personally recommend Hostgator for hosting single or multiple DotNetNuke Websites.
DotNetNuke Tips and Tutorials
Install DotNetNuke to Godaddy root
DotNetNuke Türkçe Hakkinda Hersey