Well for the thermal/nv issue i really have no idea. I checked out the roc forums (spambot central) hoping to find an answer, But nothing. Nothing on google either. I'd have to say the people doing this are either.. A: Cheating, B: Exploiting a bug. You could always disable the use of the goggles.
Demos, I demoed myself for 5 mins using both thermal & night vision on a test roc 2.1c server. When playing it back i saw what i saw in game, I had to test it's been a while since i've used the goggles lol. Anyways, That's a new one on me or im just getting forgerfull. Im sorry i couldn't be more help.
PS.. Added you to my msn.