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Thanks for testing Mamba.
The directories and "save original" is checked in preferences. So that's not the problem.
I forgot to mention that the image resolution must be smaller than set in preferences.
I see now the default is 600px. So forget what i first said about 640px. Upload a picture image smaller than the size your have set in preferences.
You should not be able to download the original file (compare the file size and see for yourself).
I see the original file is saved on the server. But still the medium image (that file is used when viewing images online) will be downloaded when you click "download original".