Hello,
This is a known problem, and the devs are aware of it. I use the exact same setup. firefox, old graphics, and 1.0. I get the same problem in less severity anytime plane groups are ordered to do anything. I find that the game will completely freeze up very rarely. Most of the time if i select another unit, the plane will go ahead and finish its animation. this may take up to a full minute when there are a lot of planes in use.
Its annoying, for sure. especially when the planes disappear at one zoom setting and the enemy units turn invisible at another zoom level.
I recommend being patient and letting the plane animation catch up to "real time". even tho your plane is frozen there at the patrol tick for a long time, 99 percent of the time it will go ahead and finish. I dont refresh unless it just goes too long, because I know that the next time i split or order a stack of planes it will do the same thing. *Note the upper left hand corner of the screen when this happens. most of the time you will see a little phantom plane sitting there, trying to do what the "stuck" plane stack is doing.
Hope this helps.
Storm
