I'm working on a Mac, which did an auto-update that apparently force quit Lightroom 5, which hadn't been closed for a week and thereby had a lot of "unsaved" work in its temporary files. Now when I open the catalogue I'm back to where I was a week ago, with non of the new changes. However, my time machine back up has backed up .lrcat, preview.lrcat, .lrcat-journal and .lrcat-lock files from right before the shutdown which should--in theory--have the data I need in them. How do I restore this data? I've tried several different methods with no luck yet. Thanks!
If it backed up the lock file, then Lightroom was open when Time Machine ran, and the backup therefore may be corrupted. You could try restoring that backup (without overwriting your week ago version) and see if it'll open. If it does, you're off and running. What methods have you tried?