Operating Microsoft Outlook 2007. The owner of our firm would like to change his existing signature. Back in December 2017 he had no issues doing so but now he is unable. Going into Tools - Options - Mail Format - Signatures does not work. He can get there but once he hits Signature he does not get the pop-up window allowing him to make any changes. We have also tried the shortcut route from a new email and nothing happens.
Any suggestions on how this can be corrected?