Ok, I was playing a mission, when it started to lag, really bad, it was with big c and you can ask him how bad it was, spawn crashing, the works. Then I decided to practice, so I did mission seven, easily took out the attacking planes then boom, invisible zepp. Pics here:
Before, I had shot about where the engines should be, but I couldn't shoot the actual zeppelin, I flew right through it! Then I crashed where the engines should be. Also, what's with the weird new practice plane? Oh well.