I usually have fps set to unlimited, VSync and TB on and my monitor set to 30 Hz. However, I made a dedicated test where I set the monitor to 60 Hz, fps internally limited to 24 fps, VSync and TB off, yesterday. Autogen still did load in patches when flying along the same route as long as I set autogen draw distance higher than medium.
I don't use NVI any longer at all.
My offer was serious. Perhaps there is indeed "something" (a peculiar setting or some hardware aspect) removing the issue for Rob A. and the like. Albeit I doubt it's just "you have to lower your settings given your hardware". I lowered several settings to the minimum and the issue still persisted, as long as I kept the autogen slider above medium.
Kind regards, Michael