b) About the color white yes, I have an issue there, let me be more specific , I can barely see the scrollbars. I can't even find the scroll area since everything is white. 

This is the issue of the theme. I think this is observed only on certain screens: the gray becomes too white. I actually only saw this problem with my own eyes when connecting a crappy windows laptop to a projector. But, I am not sure this is the problem you are reporting. So just to check, now that we are at it, when you open Nautilus, do you see the scrollbar? How about the background of the Hierarchy button?