@jonko. Thanks for the info. You forgot to mention what was the name of the file you tried to upload.
Without any more information, it could be that the mime type that is detected is “application/octet-stream”. Some php web servers read the mime type of all image files as “application/octet-stream” instead of “image/gif;image/jpeg;image/pjpeg;image/png;”.
To find out what your file is detected as you can run test_script3 on your server, and copy and past the results in a post to me. Or, if you want more privacy, just send the result to my email. You can actually customize the file to test the specific file you are trying to upload. just place your file in the same directory as the test script file.
Hope this helps.