Email address disappears when in write mode

Thunderbird 31.4
My partner and I have exactly the same setup (win 7). When she writes a new mail and starts to type the email address to send to it pulls the list from address book as expected BUT when she selects the recipient and presses enter the email address disappears. If it is not to an address book entry (i.e a new email address) then it works ok. Mine doesnt do this.
Is this a known problem and is there a fix.
Suggestions welcome please.
John

That should be 10.9.5

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