The autopilot in the current version (4.0) was originally put together for the FS9 version and then adapted for FSX. It was built on top of the MSFS autopilot, but most of its functions were custom made with local variables. It has been known to be more than a little “quirky”, did not respond to key commands, and I have never been happy with it.
I have spent the last week building a new autopilot from scratch, using as much of the stock FSX autopilot as possible and adding only a minimum of local functions. The new autopilot is still close to the real thing, but it has better performance, is less buggy, and can be controlled completely through FSX key commands.
The aircraft can now be flown comfortably on autopilot up to at least 13000 meters, where it stays at about Mach 0.8 in altitude hold mode. No sudden disconnects, no freezes. I am quite happy. ;)
Getting closer to something I can release as beta 2.
Stay tuned /Tom