Looking at the changelog it looks like the culprit has landed in:
```
-- Marco Trevisan (Treviño) <[email protected]> Sat, 06 Aug 2016 16:25:58 +0000
unity (7.5.0+16.10.20160727-0ubuntu1) yakkety; urgency=medium
[ Andrea Azzarone ]
* [LockSceen] Remove numlock warning. (LP: #1526322)
* Make sure initiate and terminate callbacks are not empty before
calling them. (LP: #1605012)
* Properly destroy close_button_ to properly disconnect lambda. (LP:
#1605010)
* Use the standard notification-device-eject in the "device eject"
notification. This allows us to scale it properly on high-dpi
setups. (LP: #1605231)
* Add tools to enforce unityshell plugin for the current profile and
add "move" and "resize" plugins as requirements. (LP: #1506023,
#1605007)
* When locked discard damages from windows below lockscreen. (LP:
#1605180)
[ Eleni Maria Stea ]
* DecoratedWindow: Added shadows for shaped windows
[ Marco Trevisan (Treviño) ]
* LockScreenAcceleratorController: ensure callbacks are valid before
calling them (LP: #1605012)
* DecoratedWindow: Cleanup shadows for shaped windows, reduce
recomputation
```
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https://bugs.launchpad.net/bugs/1620728
Title:
Unable to remove launcher plugin from
org.compiz.core:/org/compiz/profiles/unity/plugins/core/ active-
plugins since last release (7.4.0+16.04.20160801.2-0ubuntu1)
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