The following bugs still exist...
1) The constant yelling of 'Move up, go forward!', over, and over, and over, all through the level. This problem even occurs when no marines are around.
2) The 'defend the helicopter' final stage does not initiate, the enemies do not show up, and Delta Squad glitches. This error makes the level impossible to finish, and some of us have yet to progress through the rest of the game because of it.
There are video recordings of both these bugs taken by others players, and if you look within the comments (and previous threads on other forums, including steam) many have expressed the exact same problem.
Bug 1) http://www.youtube.com/watch?v=VdP7Gv1EyYU
Bug 2) http://www.youtube.com/watch?v=QciBjdk3fCQ