During the conversation with the Illusive Man at his base, Shepard's character model keeps flashing. What is causing this, and is it possible to fix?
I am playing on the PC with all graphics on max. My GPU is a Radeon HD 6870.
This might just be a case of needing to upgrade your graphics card drivers.
Edit: Just for clarification, this usually happens when the subtle movement of a model, in this case Shepard, is having its lighting updated inappropriately. This could be a restriction on older graphics chipsets too.
Well upon some more research, it seems that this is just part of the game, and no fault on my end.
Hopefully it gets fixed in a future patch.
Have you tried playing around with the video settings? I'm actually using the same card, bought it specifically for ME3 and Skyrim. I was having this issue as well while talking to garrus and liara, but I fixed it by lowering the graphical settings, playing for a bit, restarting the game, and then raising them again. I am unsure whether this will work for you or not, but it can't hurt.