Office 2013 Mailmerge, selecting data source

When I am doing a letter Mailmerge, I click Select Recipient/Use an Existing List and expect to see a select a file dialog box. Instead I get no response. This happens with an existing Word document or an empty file. I'm stuck.

How can I select the data file?
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John FistereEngineer, retiredAsked:
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John FistereEngineer, retiredAuthor Commented:
I was in compatibility mode (.doc). When I saved it as a .docx file, all went well.

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John FistereEngineer, retiredAuthor Commented:
I'm not sure what the solution really is. To get the drop-down selection to work reliably, I had to type the underlined menu letter (e) to make it work. Same for another Word drop-down menu too.
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