It was also me who created this particular thread (Archived Post) and although I can't say when the issue was gone for me, I didn't experience it for quite some time and thought you've fixed it (still using the same GeForce GTX 460, no change for me in neither hardware nor software). Ever since S6 launch though it still persists again...
It's like zerobang's saying - try looking into the previous code, as even though it might have not been fixed for ALL players, it was definitely better for SOME of us before S6.
I get this too, on a lot of system maps. Looks a lot like texture z-fighting. Always cloud/nebula textures, never stars. Been happening for as long as I've been in the game (about 10 months or so), sometimes more often, sometimes less, but always present to some degree. As far as I can tell, it has never been fixed then re-broken, it's just always been broken.
Windows Vista SP2 64-bit
Intel Pentium E2180
AMD Radeon HD 6870
I notice it most often during certain Borg encounters.
Area's of the space background will be flickering, just like described above, looking like multiple textures are fighting for the same space.
I've noticed this on multiple maps, it happens consistently when it does happen, like it is always the same maps or space backgrounds that it happens to.
I've seen it on different missions, and most recently when exploring a random system in the Khazan Cluster.
I had noticed this awhile back, and have since then updated my drivers many times, and have tried a multitude of different graphical settings; I'm even on an entirely new PC with the same issue.
I have noticed when controlling the camera while looking at this texture issue, adjusting the camera so the nebula is as far to the side of the camera, makes it look normal as if it were fixed, but looking directly straight-on at it ruins it again.
The only thing that I can think of that changes during this might be the distance from the 'backdrop' since because of the fish eye affect of field of view, the nebula would be further from the camera when looking straight on at it, then when adjusting it to be at the edge of your camera. I hope that makes sense.
Windows 7 x64 Home Premium
Intel Core i5-2500K @3.3 Ghz Quad
Nvidia GeForce GTX 650 Ti
8GB DDR3 RAM
2013 and I'm still getting the flicker. It may not break the game Cryptic but it sure as heck ruins the experience as far as immersion goes. :/ This has been happening for 2 years. How have you not fixed it yet? o.O'