Expand Control in the Tree
 

I just updated to 4.2 from 3.5 and noticed that the control to open an item with children is now a small triangle. It is much less visible than box with the plus in it from the previous version (see screen shot clip in the attachment), especially on a high resolution monitor. Is there any way to make the control more visible, or ideally change it back to a plus box?

If you uncheck Tools | Options | Trees | Show tree lines, it might be a little more visible and will match the standard look of tree controls in Vista/Win7. To get the old tree look and feel (for UR and other tree controls), change your theme to Windows Classic.
http://www.youtube.com/watch?v=bAV8bM8bwi8