I just started to play multiplayer yesterday and I've noticed that the yellow circles underneath units are now hard to see.
Some times only 1/4 of my units will have the yellow circles and those yellow circles are really half circles. It is making it very difficult for me to know if I've selected a unit or not.
My video settings were the default "High"
P.S.
The yellow circles were fine when playing single player though, but for single player my settings are on "Ultra"
Edited to include my PC specs:
Intel Dual Core 3.0 GHz
6 GB RAM
Nividia GTS 450
Windows 7
Was played using DX11