Somewhat related to the original post - could you please make sure that bitmaps display correctly in the viewport if nested in any maps that are common for this workflow? For example, Tonemapping Control and Color Correct too.
For example in a setup like this:
Bitmap (Max or Corona should both work correctly) > Tonemap control > Color Correct > SelectMap
I'd expect that maps display correctly according to their display mode (screen, mapped, environment) in the viewport. Tonemap control doesn't have to simulate its particular settings, but it should definitely pass the map correctly down the map tree.