Thanks for the great program!
In 'setup', 'download options', I have ticked the option to create a sub folder based on 'NZB/root node name'.
I don't know if this is a small bug or not but I noticed that if the collection name in the download queue contains a '[' character then the downloaded rars are placed in the root folder instead or the newly created sub-folder. I assume it is because the '[' character stuffs up the path name.
I haven't found this to be a huge problem because it can be simply rectified by renaming the collection name prior to download.