Hi Tom, the project size is 960×720 25p. I tried with a still image 1280×720 png, with a 960×720 and even with a clip of the same project… Always the same result.
Of course… you can do any project that you want … select and copy all clips and paste them in your final project. You can use “Compound clip” if you prefer
I have the same problem. Sometimes I use a simple “Rename” program to change the files name in Scratch “Original Media” folder. If someone knows another way…