Some bugs I've encountered

The following are bugs I’ve encountered while playing Halo:CE and Halo 2 campaign. I haven’t played 3 or 4 yet.

CE
After last week’s update I have been losing my mission’s progression.
I have had to replay a couple of the levels numerous times.

Halo 2
The screen will stay black after respawning. I can hear the game, but I can’t see anything. When I pause the game the screen will go back to normal, but when I resume it the screen will go black again.