I am trying to "View Report" (summary with graph) this has been working fine for 30000 email since 8/10/2010  I am having timeout issues again it works for 3500 email and yesterday was working fine for 7000, today it does not work for 7000 or 14000
I don't know if it has anything to do with the last update 1 month ago 4.30.60 but is was working before the update.
Some additional symptoms if it helps: following the timeout, events become unavailable until I restart the application.
This is what I get when trying to view events:
 Error: Event Viewer is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Specified argument was out of the range of valid values. Parameter name: Index ---> System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: Index at Microsoft.VisualBasic.Collection.FastList.get_Item(Int32 Index) at Microsoft.VisualBasic.Collection.get_Item(Int32 Index) at DotNetNuke.Services.Log.EventLog.DBLoggingProvider.DBLoggingProvider.PurgeLogBuffer() at DotNetNuke.Services.Log.EventLog.LogController.PurgeLogBuffer() at DotNetNuke.Modules.Admin.Log.LogViewer.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

Any help will be greatly appreciated.

I am running DNN 4.9.4
Optin email 4.30.60
Server windows 2003
MS SQL 2005

I have moved the DNN instance on a different server with no change.

In addition when I try to generate reports from the control panel this is that I get after processing for a couple of minutes.

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500