I can't reproduce this with standard Ubuntu packages. Please make sure you are using official ubuntu package versions before logging behavioural bugs:
Package: unity 6.2.0-0ubuntu4 [modified: usr/lib/compiz/libunitymtgrabhandles.so usr/lib/compiz/libunityshell.so usr/share/compiz/unitymtgrabhandles/images/handle-0.png usr/share/compiz/unitymtgrabhandles/images/handle-1.png usr/share/compiz/unitymtgrabhandles/images/handle-2.png usr/share/compiz/unitymtgrabhandles/images/handle-3.png usr/share/compiz/unitymtgrabhandles/images/handle-4.png usr/share/compiz/unitymtgrabhandles/images/handle-5.png usr/share/compiz/unitymtgrabhandles/images/handle-6.png usr/share/compiz/unitymtgrabhandles/images/handle-7.png usr/share/compiz/unitymtgrabhandles/images/handle-8.png usr/share/compiz/unityshell.xml]
I can't reproduce this with standard Ubuntu packages. Please make sure you are using official ubuntu package versions before logging behavioural bugs:
Package: unity 6.2.0-0ubuntu4 [modified: usr/lib/ compiz/ libunitymtgrabh andles. so usr/lib/ compiz/ libunityshell. so usr/share/ compiz/ unitymtgrabhand les/images/ handle- 0.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 1.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 2.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 3.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 4.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 5.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 6.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 7.png usr/share/ compiz/ unitymtgrabhand les/images/ handle- 8.png usr/share/ compiz/ unityshell. xml]