+1.
Switching ADS to click to hold fixes the problem. Otherwise, all you see is a white dot in the middle of the screen, a prompt to zoom (sometimes it won't even display the key to press), and that's it. When like that, it doesn't work at all. Using the workaround, the screen changes to the tact. visor, allows you to zoom, and everything else. Another problem I have noticed with the tact. visor is sometimes when in it, the HUD goes invisible, but the screen remains gray and disolored as you are still in it, but zoom and etc. will stop functioning.
Basic specs:
GTX 480 (Forceware v331.65)
3770K
16GB RAM
Gigabyte GA-Z77X-UD5H Rev 1.1 BIOS F14
Win7 Home Pre. x64