Had the same problem.
Ubuntu 16.04 64bit, Slack v 2.0.3
This workaround mentioned earlier seems to work for me:
sudo touch /usr/lib/libunity-electron_notification_fix
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sometimes when starting a copy operation there is no dialog at all!
1. drag and drop files
2. nautilus does its thing, but without any dialog or other info (except the
little progress bar in the unity side panel thing)
3. clicking on show copy dialog only makes the "files launcher" wiggle but
pro
