I'm getting a solid polygon appearing in the area just beyond the HUD (see screenshots).
Only seems to occur with the Su-33 (no glitch with the Mig-29 and Su-27) and only at night (in-game trigger time approx 21:07:37)
Steps to reproduce: Load up the attached mission, unpause and wait about 7 seconds.
NVIDIA GTX460 Night_Su33_Test.miz