Hi Daniel,
do you mind sharing info/links related to that? I may have a case opened that may be related.I am using Debian Live on USB, with an ext2 partition for persistence. I get frequent filesystem corruption. I've used 3 different USB sticks, but I still get these problems.it's a known problem inherited from aufs where you cannot unmount the persistency partition during shutdown. it might get better with aufs2.
Cheers Luigi