Yes, I've just lost my system partition, too. I got a series of emails with blank titles from a mailing list, and it made YAM throw up. It crashed, left files open, left the window open on the Workbench, and exited. A real mess. I restarted, waited for disc to be validated, then continued with downloading the email for the day. Next in the blank title thread and it crashed again.
This happened about three times. Now the partition is screwed and I've just spent the last 3 hours salvaging what I could since the last backup (from last week) and reformatting it. Thank God for FFS and Quarterback.
Now rebuilding system partition . . .
tony