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I've fixed up the image-based captcha to read from subdirectories, which should put less load on the file server.
Also I've gone ahead and enabled it for all wikis, partly in response to concerns that there's some possibly machine-based mass registration going on which might be malicious.
If there's problems, let us know.
- -- brion vibber (brion @ pobox.com / brion @ wikimedia.org)