Here’s an idea….do you know the update history of this machine?
If leopard was installed on top of tiger, or if FCS2 was installed on top of FCS1, as opposed to doing a clean install from scratch, that may be the cause of many of your issues.
Block out a day, back everything up, and reinstall everything again from scratch. Remember, if your current version of Final Cut (or even the OS) is an upgrade, you can use THAT version to install; you just need the serial # from the previous version.