FCP 7 has a couple bugs that have driven me mad! A specific one is where all the clips in a sequence take on the sequence’s name. They also forget how to match-back or reconnect media. This can be devastating to a long off-line sequence. I believe I’ve nailed down why this happens (thanks to my friends on Twitter). The bug occurs when you duplicated or copy/paste a sequence that starts with a freeze frame or still image. If you remove that still or freeze frame before duplicating, you will avoid the bug. Then just re-add that still to your newly duplicated sequence. Step one, though, is always backing up your work daily and making sure you have an auto-save vault.