It was a very tricky bug in an unreleated decompression routine that would sometimes corrupt important internal variables in Chopper Alley. On some systems, this could happen almost every time. If there is one area in Chopper Alley we could do over again, this would be the one.
All choppers have much improved range - between five to ten minutes, depending on the chopper.
Next week, version 1.2 will be released. We have redesigned the way enemy units work together. When your chopper is within range of a mobile radar unit, the aggression level of all units will be increased - they will fire both more often and more accurate. So a good tactic will probably be to seek out these mobile radar units first. Disabling these will render mobile rocket units pretty much useless.