SlickEdit 2016 x64 21.0.0 has serious copy-insert issue between edit buffers. Intermittently the insert will do nothing. If I create a new empty file I can insert my selection to that file. Then I can go back to the file I want to insert to and the operation works. This plus the fact default UI changed is sending me back to v 20.0.3.0. I dont see any more SE upgrades in my future, too many wasted cycles on issues like these.