We lost some data from fuwiki today. This is the only instance where we have actually lost successfully commited changes. The repository became corrupted and I had to switch it back to a backup I made in the morning.
The cause is very likely that we changed the URLs that svnwiki passes on its calls to the libsvn_client library to checkout the repository for fuwiki from HTTP to direct file access (a file://localhost/.../ URL).
Oh, and while we're at it, here is some behaviour in Subversion that I find annoying.
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Last update: 2006-11-14 (Rev 9301)