I have been able to change the background color after installing the updates by changing
Tool / Options / Environment / Text Editor / Highlight Current Line (Active)
Is there a way to change the highlights border width or color?
I like having the highlight so I would prefer not to just disable it. But it would be nice to either eliminate the border, make it smaller or change the color.
Seems to be this behavior was fixed since original answer was written. So answer needs update and here it is:
https://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/3012415-remove-the-light-border-around-highlight-current
Go to Tools > Options > Environment > Fonts and Colors
and look there for Highlight Current line, active and inactive. To remove border as described by VS team by link and cite above.