Thank you for your help. I got it working. If I check the root level of a folder to enable nofication on all threads in that forum, it does not retain the check mark. I check the check boxes of all threads and that is retained and I do not get the error message. I don't understand the issue or why this resolved it.

Enlighten me. Thanks!

Here is what I get in the event viewer when a user tries to start a new thread.

ModuleId: 1738
ModuleDefId: 107
FriendlyName: Add/Edit Post
ModuleControlSource: DesktopModules/Forum/Forum_PostEdit.ascx
AssemblyVersion: 04.07.00
PortalID: 4
PortalName: Northstar Camaro Club Forum
UserID: 20
UserName: jsmith
ActiveTabID: 487
ActiveTabName: NCC Forum
RawURL: /forum/NCCForum/tabid/487/ctl/PostEdit/forumid/28/action/new/mid/1738/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.northstarcamaroclub.net/forum/NCCForum/tabid/487/forumid/28/scope/threads/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; .NET CLR 1.1.4322)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 4ad936bb-cb2b-4075-9721-608de6a3bb14
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Forum.PostEdit.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.Forum.PostEdit.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---
Source:
Server Name: WEBD19