This was a problem in fallout 3 although it was outdoors. It is laughable that the problem exists in new vegas but only indoors. Is there a fix for this?

Oh it exists outside. they just adjusted how much sky needs to be visible and what time of day/cloud cover needed to triger the effect. but yes. thoes borded windows like the one if the doctors house you start in are like strobe lights.

I'm told it's a "hard ware issue" with 200 series cards from nVidia. I dont buy that myself but some one with a 400 series says it works fine with the new hardware.

Nope. With SLI disabled the issue goes away. This has been plaguing this engine for a long time now.

What sort of flickering? The distant land flickers at time as do the occasional texture. I made a save game and tried every and all possible combination of settings and it still happened so it's just the game

Do you by any chance have ambient occlusion forced on though? It's forced off by default, but if you used something like nividia inspector to force it on (or perhaps forced it to use FO3's profile like I did before to get rid of the HDR blobs with AA on) you'll get loads of flickering since it was never meant for it (and FO3 was meant for it but you still get loads of flickering)

nope. AO has nothing to do with it. Its SLI only. This problem was never fixed in fallout 3 either.

its not just nvidia cards.
my brand new Radeon HD5970 shows this bug aswell. the only fix is turning the water settings to low.
im not sure they'll be able to fix this without developing a new engine. man a new engine would do wonders for this game.
currently my game is freezing all the time due to the chauncey bug.

I have some very annoying lighting issues, but I'm not sure I would call any of them flickering. I have a GTX 265 in this particular machine.

1) Indoors lighting will seem to lag when my pip boy is on. That is, areas under lights will be very dark and I will see the lighting from them fade in to existence (area brightens in about a second.) It makes things pretty disorienting. The problem is worse when the pip boy is on - area between pipboy light and other light sources will be (always whenever indoors, does not lag or go away) much darker than they are when the pip boy is off.

2) Upon entering certain areas (like Lucky 38 casino floor) the entire game will become almost unplayably darker when in non sun-lit areas. It seems that when this happens, NO light is coming from any light sources except the pip-boy light. The only thing that solves this is exiting the game, loading a save before the lighting glitched, and then loading the save after it glitched. This fixes the problem each time until it glitches again. Loading the save after it glitched after restart without first loading an earlier save does not solve this. This problem happens regardless of whether I use HDR, Bloom, or "none" for filter effects.

Oh but it's not only happening in SLI. It also happens with a single card. I have a GTX 470 and I can tell you that this bug is still there INDOOR ONLY.

i just turned SLI off. The game runs just as good on one card as it does on 2 or 3. Actually better in my case. Even with just 1 card the load on the gpu doesnt go above 50%.....ever, for me atleast. with more than 1 card each gpu never went above 20%.

Indoor only, and yes in a single card, (5850 for me).