Auto name complete not working in Outlook

Hi all, On my PC running Windows 8.1 the auto complete function when entering e mail addresses in Outlook is not working. When I start to enter an address a drop down suggestion list appears immediately below my entry, but when I click on the required e mail address nothing happens. The letters that I have typed in are still in the entry box and the flashing curser still at the right hand end of the input, but the drop down list disappears. Any suggestions appreciated. Best Regards Norman

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