I have the same problem. Since all my categories are on the server, rather than trusting any repair method I simply made a new calendar file and recreated my sets. That worked great for a few minutes, then I got "data needs repair" again. "last update" is "never". However, it appears that all my appointments are there, I just have to avoid looking at the server status. I'm rather used to that, since on the server itself it's been known to say "down" for months at a time even though it works.
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