I've set the highlihgt option and I've changed the default colors. I've noticed that when VS looses focus and gains it again (for instance, when I change from VS to another window and back again) the line is selected, tabs and enters are correctly processed but none of the other keys is. In other words, suppose I've got this:
var t = | //<- | is the cursor.
and then I use alt+tab to change to another window and then back again to VS (by doing alt+tab again). I can hit enter and there's a new line. If I try pressing any other key nothing happens. In order to write again, I need to use the mouse and click on that line.
Is this a bug?