Comment 4 for bug 1068783

OK, with some pointers, it does look like it's related to that bug. I finally some found notes that coincide with the crashes which have been truncated to 0 bytes:

-rw-rw-r-- 1 bladernr bladernr 0 Oct 19 13:26 571943ec-c757-4921-b308-860aa3e516c9.note
-rw-rw-r-- 1 bladernr bladernr 0 Oct 19 13:26 668cdaf2-c086-4f04-b18d-4fb8d09dca3f.note
-rw-rw-r-- 1 bladernr bladernr 0 Oct 22 14:26 b67e4067-5d0d-43a8-9f22-f31e24499c0f.note
-rw-rw-r-- 1 bladernr bladernr 0 Oct 22 14:26 ba7ddba5-c94b-4b22-89d3-336e325cc054.note

And they do not have corresponding copies in Backup.