Hi, Andrew.
I can't reproduce this problem. It could be that Scratch is having trouble with one particular file. Can you import images from the media library that came with Scratch? For example, can you import "bee1" from the "Animals" folder in the "Costumes" folder? If it's only one file that doesn't work, you could try coverting it to another format that Scratch can read (GIF, PNG, BMP, or JPG).
-- John
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