ok the problem I'm having with the A/P is it will continue climbing past my set cruise altitude.  It switches to SPD above 10,000 ok.  When it's about 5,000 above my cruise altitdue, I try clicking FLCH with the correct altitude, so then it starts descent, but it seems like it will wander all over the various flight levels.  It's even gone nose down at very dangerous levels that I found myself at 3,000 feet within seconds while trying to turn to next waypoint.

I have uninstalled fsuipc 4.5 and reinstalled 4.5.

What should the A/P look like during climb then cruise?