I am running OpenOffice 3.3.0, OOO330m20 (build:9567) under Linux (Fedora 14).

I created an ODT file (file1), which I had opened along with another ODT
file (file2). My company had a brown out, causing my computer to reboot.
After I came back up, OO told me that I had two files to recover, I clicked
"Start Recovery", and both were recovered with no problem. I continued to
edit file1, saving every now and then, and in the afternoon we had another
brown out, again causing my computer to reboot. After the computer came back
up, this time when I started OO, it recovered file2 just fine (I had made no
changes to it), but it warned me that file1 was locked by an unknown user
(I'm quoting from memory). I did a "ps -ef|grep <filename>" and
"ps -ef|grep pen" and saw nothing. I can't remember, but I may have
shut down OO and started it again. Either way, OO asked me if I wanted to
recover file1, and I clicked "Start Recovery", and OO popped me
into a blank file, "Untitled 1". When I did an "ls -l" in my Documents
directory, I saw file1, but with 0 bytes - completely empty. OO had,
apparently, "recovered" my file by blowing it away entirely, not just
my most recent changes, but everything. It was not in my backup directory in
my OO prfile, either. Don't trust Ctl-S, don't trust file recovery.
Print documents out on paper.