Run mail merge on any document/data source, but open mail merge toolbar beforehand.
=> The toolbar isn't refreshed right away (counter is at -1, and buttons are greyed out). Clicking into the document refreshes the toolbar.
Observed using an LO 6.2 master build (40e431def06b72cc87226cd50c271b42a1adfbbe) / Windows 7.
Thank for creating a patch for this, Mike!
Mike Kaganski committed a patch related to this issue.
It has been pushed to "master":
tdf#117817: Update Mail Merge controls after wizard completes
It will be available in 6.2.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.