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I imported consecutively numbered PNGs, and they are showing up as white images. If I create the same images as PSDs, they import fine. (Both are coming from Photoshop). Any idea what I might be overlooking?

Youl'll most probably have to check the alpha settings in your export software and/or TVP.

Thanks! I also got a result by having the TVP import use "Guess" (rather than "Alpha Only").