Zuper ... I too am having issues since the update. I can no longer play the game at all, because within seconds of taking off the entire game gets jittery, and all the sounds begin echoing... it's impossible to play. If I go into practice mode the game behaves normally, with no problems at all.
Today I even upgraded my wireless router from a slow "G" model to a much faster "N" model ... All of my wireless devices have benefitted from this upgrade, but Dogfight is unchanged ... plagued with choppiness and sound problems.
One interesting note: In the past when the game was choppy the sound was never affected ... only the smoothness and refreshes on video. Don't know what you changed in the update, but PLEASE roll back to the last update so that the game is playable again.
Thanks in advance,
Steve