After I suck down some more coffee, I'll be getting on this to test those changes Maryadi posted. I always fly all Realism sliders full right, as well. Perhaps taking one down a little will also alter the roll situation. A lost of .air file settings consider the realism sliders thus: Full right, 100% effect of the setting in question, ANYthing below full right, the .air file considers 50% effect, or even 0% effect. So, just adjusting the General Realism (usually) slider to anything other than full right can have a large effect. Much larger than it seems it should, but that's how .air files work. Now, if the settings in question aren't included in the .air file, many in R1534 and higher, then the realism sliders wouldn't have much effect. Since many are over-ridden by the aircraft.cfg settings, the sliders don't matter any way, but I still leave mine full right, just to be on the safe side.
I will then, if the roll is gone, try seeing if I can figure out just which entry Maryadi added is the "secret" entry that fixes it. I'll try just adding one of those last 4 entries at a time to see which, if any, is the magical entry that fixes everything.
Again, more testing ASAP. I will post my results this afternoon (my time, PST) or at worst, this evening.
Mark,
it sounds to me like your EXE.XML got changed/corrupted somehow. Have you added, or changed, anything that could do that? This includes Windows updates, which can have unexpected effects. May I suggest you take and make a copy of your existing EXE.XML file and store it someplace safe, like in the FSX folder, since it doesn't look there for the exe.xml file. Then, make sure the only entries in the EXE.XML file in the normal location are the regular, first entry, that it comes with by default, and the AICarriers entry, unless there's another entry in it you absolutely must have to make the sim function properly. This way, we can be certain nothing is changing or altering the AICarriers entry. Then you can start adding any other entries to your EXE.XML file that you have. Remember, you have to shut FSX down, and then restart it to see any changes to the EXE.XML file. Kinda time consuming, buuuut...
Another thing to check, especially if you have gotten any Windoze updates installed, is whether your .NET Framework needed for AIC is still installed AND running. If not, you may need to reinstall it.
You can also try starting AIC manually with a shortcut to the AICarriers.exe file in the AICarriers install folder you would normally start it with the EXE.XML. Always Run As Administrator. It sounds to me like, for some reason, AIC isn't starting automatically when the sim starts any longer. Now let's see if we can figger out why

We'll get it. I'm stubborn...
By the way, I don't get the low altitude Jitter that Mr. Seawing has mentioned. I can post my computer specs if you want. I am using FSX:SE.
Be back with test results ASAP.
Pat☺