I've created a mail merge document in 7.0 for printing envelopes. When I select File/Print, then a dialog box pops up: Your document contains address database fields. Do you want to print a form letter? I click Yes, and then nothing happens -- no additional dialog box or anything. Normally at this point I'd go to look at the log, but I don't know where LibreOffice on Windows stores its logs. 7.1 Alpha exhibits same behavior.
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Created attachment 168003 [details] File used for trying to print envelopes
I tried printing envelopes again tonight, and tonight it worked. I don't know what's different, but since it's working for me now I'll close the bug as RESOLVED WORKSFORME.