Radeon 9500 Pro Anti-Aliasing just won't stay on

I recently installed the above card and I can't seem to get it to force AA on all the time. I have installed the latest ATI drivers; for some reason, the Omega Corner ones didn't seem to work for me at all, so I'm using the ATI ones from mid-March. I also have the Rage3D tweak program with the extra control panel tabs, which *should* force 6xAA and 16xAF all the time. That's the way I have it set.I have AA and filtering turned off in FS2002 but have everything else pretty much maxed out. When I first go into the program and to the Create a Flight screen, AA is obviously working because there are no jagged edges on whatever plane happens to be spinning around. I've also had it working at times during flights, but generally it doesn't. What that says to me is that when there's nothing much going on, AA turns on, but whenever there starts to be a lot of scenery, more moving objects, higher resolution, etc., it turns off. AF must be working, though, because blurries are a thing of the past.So, I guess this is some sort of built-in thing to try to help performance, but the question is: how do I turn it off? I don't mind if my frame rate drops--I'll lower some sliders if necessary once I can evaluate how bad it's going to get--but I want my 6xAA all the time.I don't know if this might be somehow tied to the known XP refresh rate problem. I have tried virtually everything to fix this, too. One website I saw recommended setting custom display modes to 100Hz even if your monitor doesn't support these higher resolutions; I tried this but it had no effect on AA. I also tried forcing a low (60Hz) refresh rate and that didn't help either. I've tried pretty much every resolution from 1024x768 on up. I would prefer to fly at 1280x960 if possible, but at this point I'll take what I can get if it includes AA.Here are my specs:Sony VAIO P4 2.4 GHzWindows XP Home19" and 17" monitors2 80G hard drives512 MB DDR RAMATI Radeon 9500 ProFS 2002Thanks for any help,Marc