I inserted a "birthday" field (Date), then the registration page won't show, and I get this error in logfile:

AssemblyVersion: 04.03.05
PortalID: 0
PortalName: Sisimiutcity
UserID: -1
UserName:
ActiveTabID: 253
ActiveTabName: Bruger Registrering
RawURL: /Default.aspx?tabid=253&def=ErrorMessage
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.sisimiutcity.com/
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 3e33a764-a9a1-4d32-bf55-ce4d3c418a43
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DataSprings.Modules.DynamicRegistration.DateControl.Populate_MonthList
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 DataSprings.Modules.DynamicRegistration.DateControl.Populate_MonthList() at DataSprings.Modules.DynamicRegistration.DynamicRegistration.PaintTheQuestions(Boolean blnReadOnly, Int32 MyUserID, Boolean blnGetData) --- End of inner exception stack trace ---

I use danish (dd/mm/yyyy) in my dateformat in my site.