@Zecc said:
Speaking of SVN... every now and then, code other people wrote seemed to mysteriously disappear. It seems when SVN complained about conflicts he always preferred to resolve the conflict using his version and discarding other people's.
I've worked with somebody who achieved something similar. I think he actually copied individual files out of his working copy to work on them elsewhere for weeks or even months, then copied them back into his (freshly updated) working copy. There are some bugs which I'm sure I fixed 3 times.