-e: see title. when the build settings window is closed the errors are not thrown
-regression from 5.0b1

-repro:
--open attached project
--open build settings
--set target to standalone
--enter play mode with the scene
--exit play mode
--NOTICE errors:

GUI Window tries to begin rendering while something else has not finished rendering! Either you have a recursive OnGUI rendering, or previous OnGUI did not clean up properly.

InvalidOperationException: Operation is not valid due to the current state of the object
at System.Collections.Stack.Peek ()

ArgumentException: Getting control 5's position in a group with only 5 controls when doing Repaint

device.IsInsideFrame()