Doesn't scan, see changes and back up files anymore.

Using Spideroak 2.5798 under Leopard 10.5.4 - Spideroak refuses to actually scan directories for new files or changes and then back them up. It *was* working fine a week or two ago and on an older version. Last few days I've tried to use it it wouldn't even connect until I dug around to find the new version (why no automatic check for updates or a download page for them?). So now it's basically dead. It's also stalling under Tiger on my other machine. Not actually finishing backups. Did you guys nuke yourselves or something? Too much demand? I didn't used to have to monitor it like this, and now that I am monitoring it it doesn't even work anymore.

(Yes, I restarted, repaired permissions and made sure my directory structure was happy. Twice.)

If there is a preference file I should be nuking or something similar I'd like to know where it is.