Seeing the same problem on my system with Version 23.6.0 Build 21 [2017.06] x64. I rolled back to [2017.05] and it works correctly. Reinstalled [2017.06] and the problem is back. System is running Windows 10 Home with the Creators Update v1703 installed.
EDIT: Normally run Mercury theme, but problem also exists in Tungsten.
-- Ron