Zac - 2010-03-01

Hi! I use Debian Lenny. My wxdfast version is 0.6.0. I had 80% of a cd image downloaded to the disk. I turned off the machine and the next day, when I ran wxdfast, it started to download the file from scratch! I couldn't find the files anymore. Please, is this a bug or did I do something wrong? The only thing I might have done wrong, as far as I know, is that I didn't stop the download or anything, and I didn't even close the software before turning the system off. Do you think that might have cause the loss of data?
Thank you very much!