Some files won't open

[bitclout]

I have some torrent files that won't open when I try to. If I click on the file, utorrent launches, but the file doesn't appear on the list. Everything also seems normal when I try to open it via the File > Open torrent menu, but the task doesn't appear on the list. Same thing if I click and drag. There is no trace of the file that would be downloaded.

I have version 1.5.9 on Mac OS X 10.6.7

Thanks