How do I restore playlists?

For some reason, my playlists no longer appear when using Songbird 1.1 (win vista). They were working fine. I don't know if I accidentally deleted them while "exorcizing" duplicate & ghost files, or if Songbird did something wrong. Either way, I need to find a way to restore my playlists in my Songbird library. All of the songs are still in the library, but the playlists are not. If it helps, I did save a backup copy of my old profile from Songbird 1.0 before I upgraded to 1.1. Thank you very much in advance for your help!