Quote:
Originally Posted by BetterRed
See ==>> Preferences->Look and feel->Main interface->Allow using drag and drop to merge books.
The default setting is checked, you must have inadvertently unchecked it.
BR
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Thank you for the response! Sadly, it was already checked. I tried unchecking, saving, drag/drop (failed), checking again, saving, drag/drop again (still failed).
I can still highlight both and hit `m`, but I miss the drag/drop functionality.
Seems like a bug to me?