Are files moving into the download pane? If not, might be a license problem (click on the link below)
License

If files are going to the download pane but then just sit there connecting forever, you're probably seeing fake files. Always look up a video file before download with Bitzi. If the file's been rated, you'll see other users' opinions of it.
How to use Bitzi

If a file has heaps of sources but no Bitzi rating, it's often a fake. Search again, vary your search terms & stay away from files with huge numbers of sources. If you use the forum search to look for fake, you'll find lots of info.