It could be that it was checking for updates, Sandra.
I've got to say I like AVI.net. It's producing very good quality videos and you can set a target file size before you start converting. It's a pity it's rather slow and you can't edit the movie, but those are minor quibbles when you think that you can get a 64 minute recording crammed into 550 Mb and still be perfectly watchable.
Gill