• Windows 7 / Windows 2008 R2 SP2, 64-bit​
• IIS7
• PostgreSQL version 9.2.3, 64-bit
• ​.NET 4.0
• mojoPortal 2.3.9.5, 2.3.9.8

On the ~/eletter/Admin.aspx page:

1. Click "Add New Newsletter" link.
2. Create a new newsletter in the form, with or without default values for "Display name," "First name," or "Last name." 
3. Click "Save."
4. Newsletter is saved, but error.htm page comes up.
5. Click back arrows on browser, refresh ~/eletter/Admin.aspx page, and newsletter is in the list.

OR....

1. Click any of the edit/view links for an existing newsletter in the list.
2. Error.htm page comes up.

In both cases, the error does not appear on the System Log administration page, but is logged in the "currentlog.config" file:

2013-09-18 16:03:42,557 ERROR 10.91.7.11 - en-US - /eletter/LetterInfoEdit.aspx?l=313ea0e0-e8b2-4b13-95d5-8aed93f31bc5 - mojoPortal.Web.Global -  Referrer(http://uat.cvacoop.com/eletter/Admin.aspx) useragent Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36 
System.IndexOutOfRangeException: Field not found
   at Npgsql.NpgsqlRowDescription.FieldIndex(String fieldName)
   at Npgsql.NpgsqlDataReader.get_Item(String name)
   at mojoPortal.Business.LetterInfo.GetLetterInfo(Guid letterInfoGuid)
   at mojoPortal.Business.LetterInfo..ctor(Guid letterInfoGuid)
   at mojoPortal.Web.ELetterUI.LetterInfoEditPage.PopulateLetterInfoControls()
   at mojoPortal.Web.mojoBasePage.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Error occurred in version 2.3.9.5, so I upgraded to the latest version, 2.3.9.8. Error still occurs.

Thanks a bunch! That fixed it.

Gonna hafta buy you a coffee or a beer sometime!