Craig Carns wrote This may fly in the face of every thing holly but I am trying out a theory.. I am turning off Application Pool Recycling.  The reason is, I see problems tend to happen after a recycle.  I will report back any updates.

Two weeks later and NO downtime  (Crossing fingers)!   I am either getting lucky or may have found a lead to at least try out. 

SIDE NOTE:  The hosting server I am experiencinig this on is going away in less than a month and I am moving to new 64bit blades.  I will report back if the issue shows up on the new server because I plan on leaving on "Application Pool Recycling" and standard settings but all 64bit (OS,IIS, SQL)

Hello,

It happened to my 4.8.2 installation 2 times at a distance of some days each other. The problems appeared on the morning.

I just want to know if some work is in progress to fix those errors. Thank you.

As you can see below the exceptions (4 in total in less than 4 seconds, i post only the last) appeared at 19hr, a time on which our server is not heavily used, but the problem (disappearing navigation menu and error if one try to navigate to a page) persists until the morning.

A detail: at 19.11 EventViewer reports that an application pool has request a recycling event (Event ID 107 - w3svc)

Thank for your  time, goodbye

Attachment, Exception:

18/09/2008 19.15.19   General Exception       AssemblyVersion: 04.08.02;

PortalID: -1; PortalN ... 
AssemblyVersion: 04.08.02
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL: /Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer:
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider,

DotNetNuke.SqlDataProvider
ExceptionGUID: 1391915b-42f5-4ea5-afa8-76d94df8d243
InnerException: Index was outside the bounds of the array.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Collections.Generic.Dictionary`2.Insert
StackTrace:
Message: System.IndexOutOfRangeException: Index was outside the bounds of the
array. at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue
value, Boolean add) at DotNetNuke.Entities.Tabs.TabController.FillTabInfo(IDataReader dr, Boolean
CheckForOpenDataReader, Boolean CheckForLegacyFields) at
DotNetNuke.Entities.Tabs.TabController.FillTabInfoDictionary(IDataReader dr)
Source: