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As the author of that paper, I can try to help figure out what's going on. I've never seen this particular problem before, but given how WebUI is setup on anything that's not a PR2, problems are bound to crop up.

The first thing I'd check is the permissions on the database (IIRC, webui uses sqlite which is just a single file). Make sure the DB is owned by apache, and apache has rw access.

I'm not too optimistic that that's the solution, but I'd give that a try first.