On my system Bezier handles are a very thin dark blue line which is really hard to see against the grey background. The only appearance preference I can find is to lighten the grey background but that doesn't help much. Can the handles be made thicker and maybe a different colour? I've noticed that screenshots in the Classroom in a Book for Prem Pro CC 2014 show the colour for highlighting a panel and for Bezier handles is orange. Has it changed to blue in a subsequent upgrade or is this configurable?
Incidentally the book also mentions using the grave " ` " key to toggle a panel to full screen whereas on my system the apostrophe " ' " key does this so there obviously has been one change. Maybe others?