Email in Message List dows not match content of Reading Pane after reload of WLM backup

After PC repair, I had to reload my Windows Live Essentials 2012.  I initialised the Live Mail and set up my accounts. I had previously backed up my mail, using the "Export" facility, to a folder in my "Documents" folder. This folder had three sub-folders. Contacts, Accounts and Mail.  I successfully reloaded my Contacts then reloaded my Mail folder (4000 plus items).  All seemed well until I checked my mail.  In every folder, when I clicked on the "mail header" in the Message Pane, the content of the Reading Pane did not reflect the message selected.  This is the same in every folder. I have no idea what to do to correct this.