I keep running into "locked up" pages on my forum and when I aske the users that created them they all said they used the IMG tags to reference a web pic...

Here's the error I get:

AssemblyVersion: 03.01.01
Method: DotNetNuke.Modules.Forum.ForumText.ProcessMedia
FileName:
FileLineNumber: 0
FileColumnNumber: 0
PortalID: 0
PortalName: Deeper Productions
UserID: 3
UserName: beatphreek
ActiveTabID: 64
ActiveTabName: Deeper-Thoughts Forum
AbsoluteURL: /portal/Default.aspx
AbsoluteURLReferrer: http://www.deeperproductions.com/portal/Forums/DeeperThoughtsForum/tabid/64/forumid/1/scope/threads/Default.aspx
ExceptionGUID: 299bbe29-83fe-4019-86df-82aa9498cf9a
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
InnerException: Thread was being aborted.
Message: System.Threading.ThreadAbortException: Thread was being aborted. at DotNetNuke.Modules.Forum.ForumText.ProcessMedia(String OpenTag, String CloseTag) at DotNetNuke.Modules.Forum.ForumText.FormatImage() at DotNetNuke.Modules.Forum.ForumText.ProcessHtml() at DotNetNuke.Modules.Forum.Posts.RenderPostInfo(HtmlTextWriter wr, PostInfo Post)
StackTrace:
Source:
Server Name: WINHOST45

Is this from them not using the tags properly... if so, is there anyway to stop that without disabling the IMG tags?

I talked to one of my users about this last night.  He said he's seen this behavior on several other boards as well...

He noticed that if he sets his avatar, signature, or an image within the post to a very large image file or something other than a jpg/gif then it locks the threads. 

A very active user could effectively lock up almost an entire message board this way.

Not sure if there's anyway to code so that this doesn't happen or if this is really even what's going on.  He's definitely not a programmer, but it was something he had noticed.