Cannot change "Show scroll bar".

[Wheelie4]

I always kept the "Show scroll bar" set to "Always" in "General" settings in System Preferences for a long time. I decided I want to change that to "Automatically based on mouse or trackpad". Every time I tried to change it and then go back to system preferences is always sent back to "Always". I looked in the "Generalpreferences.plist" file and it shows it set to "Automatic" as you can see in the screen. But my scrollbars always show in Safari and Finder window. Anybody know a terminal command or some way to fix this. Btw I'm on an iMac with OS X Yosemite 10.10.4, a wired keyboard and a wired Kensington trackball. Any help is greatly appreciated.