UAV won't fly above ~100m on dedicated server

[Storm The Gates 1]

I've had two different dedicated servers run by GTX, using the KP Liberation mission, where UAVs absolutely refuse to fly above about 100m altitude. If I take control of the driver position I can fly them manually to any altitude, but as soon as I switch the gun view it starts dropping back down to 100m again. Several other players have reported the same thing. None of us have any problems with UAVs in single player games. Any ideas?

[stanhope 409]

Have you tried hosting a different MP mission?  Because I play a gamemode where UAVs will happily fly above 100 meters that's running on a dedicated server.