I seem to be having a similar problem. I have downloaded a movie with no issues, I have pro, which does work better for me than the free one, I am constantly downloading clips which mostly works fine, some disappear and I am cannot download them, but you can't get what is not there. Please note I live in a location where movie theaters are not accessable due to distance and the one video shop is quite a distance away, and I only download movies I can get no other way.
so the problem is with one movie, there are dozens of people with it listed, a search returns over 1000 results, some of them are common to 50, 60, 80, people. Yet I can not download the file. I have tried 30 or 40 times, no matter how many have it, 1 or 80, I get "need more sources".
What gives? Are people just playing games? Does this file not exist? It is very annoying. Especially as I am moving soon so I can get a faster connection and more band width. I am on a dial up 56k modem, is this the problem? Soon I expect to have broadband or I think it is also called adsl.
Any advice or info would be appreciated.
Oh, yeah, I also share everything I download. I now have 301 files shared, increasing constantly.

Southern Pirate