I was recently struggling with a render problem of a project. After 3 hours, after testing many things, and at last I realized that the problem was AI up-sampler tab.
If anything is selected from "Up-sampling mode" listbox, AI up-sampler feature is enabled by that.
I didn't know that. I thought that AI sampler is off because of the "Enable AI up-sampling" check box.
I think "Enable AI up-sampling" check box should be the first one there and "Up-sampling mode" listbox should not enable the feature
or "Enable AI up-sampling" check box should not be there at all
thank you