Im getting this error when trying to access DNN portals any help...  here is the error, what does it mean?

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Hashtable insert failed. Load factor too high.

Source Error:

[InvalidOperationException: Hashtable insert failed. Load factor too high.]
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +2836198
   System.Collections.Hashtable.set_Item(Object key, Object value) +11
   System.ComponentModel.TypeDescriptor.CheckDefaultProvider(Type type) +257
   System.ComponentModel.TypeDescriptor.NodeFor(Type type, Boolean createDelegator) +36
   System.ComponentModel.TypeDescriptor.GetDescriptor(Type type, String typeName) +22
   System.ComponentModel.TypeDescriptor.GetAttributes(Type componentType) +18
   System.Web.UI.ViewStateModeByIdAttribute.IsEnabled(Type type) +46
   System.Web.UI.Control.SaveViewStateRecursive() +121
   System.Web.UI.Page.SaveAllState() +466
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1676

Server Error in '/' Application.

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Hashtable insert failed. Load factor too high.

Yes its been working for a few months.

No no new modules have been installed

I can check the current version but I think it is 4.06

I can log in and navigate the the pages but nolonger can see any of the modules that were on the pages.  Earlier today I could see the modules but couldnt access the settings for the page nor modules.

I beleive its to do which the .Net2 framework read the following

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=651902&SiteID=1

apparently it is "In .NET 2.0, this error is almost always caused by multiple threads modifying the Hashable at the same time" 

hmm