My PRO 73 does this now as well. My old 1740 used to have a 1/4 inch lip or so all the way around the display and I think this was just enough to give shade. The PRO 73 and RX65 have either no lip, or extra clear plastic which allows the light right in.

I think I will have to try the X50 again in August when I get my next bonus. It appeared to have a slight lip around it which may prevent this glare.

And, I've tried moving my RD to different spots on my window. If my 06' Silverado has a glare strip along the top, it's extremely faint because I can't tell a difference at all.