Thanks - actually it's brand new stuff (movies) I'm trying to download - sometimes the video file won't play, and there's a "codec exe" that you're supposed to run, which is clearly malware. Sometimes it's password protected and you have to do some survey online to get the password. Most often, it just fails with missing blocks etc (thanks for the tip on this one)
What usenet provider, and indexer do you use? Do you use CouchPotato, or manually search for NZBs - if manually, how do you spot best download options? So far, I look for high numbers of grabs, and some comments...