You're probably seeing fake files (shared on the network to disrupt p2p). These sit connecting for ages & then get stuck needing sources forever. Always check video files with Bitzi before download, if the file has lots of sources but no Bitzi rating, chances are it's a fake

Read through these 2 threads below for more info (including how to use Bitzi) & tips.
Fake files showing up in search results
How to find music (has tips for movies as well)

The LW Beta versions have torrent support, maybe you'll have more luck with torrents. The latest Beta's 4.13.8 & you can download it from the usual LW download page.
Lime Wire » Download LimeWire

Don't buy Pro until you're happy with the way basic is working