Write fails if image has previously been manually unzipped

[srcshelton]

Do you wish to Download a Raspberry Pi compatible image (choose yes if you don't have one) (Y/n): n
Please locate the disk image (.zip, .img.gz, .tar.bz2 (.tar.bz2 only working with QtonPi distros currently): /Users/Stuart/Downloads/debian6-19-04-2012.zip
Found Zip
Found archive inputted by user, extracting...
archive already has been extracted, skipping unzipping...
/Users/Stuart/Downloads/debian6-19-04-2012/debian6-19-04-2012.img

...

Please verify this information before typing 'accept' to accept the terms and to start the process, if this information isn't correct, please press ctrl + c (^C), or type 'exit' to quit: acccept
ENDING WITHOUT COPYING ANY DATA ACROSS, SD CARD HAS BEEN UNMOUNTED