In my opinion it does not seem to be a bug. It is just a low quality.
Low Resolution(Dimension) = 640x360, 1024x576, 1280x720 = Low Quality
High Resolution(Dimension) = 1920x1080(Full HD) = High Quality
Corel MotionStudio 3D sometimes, It have the fault(bug) but please refer to the following page.viewtopic.php?f=87&t=43642Now, I have not this test_file.zip file. Sorry.
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