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I've done a complete fresh, unadultured, reinstall just in case I made some typos while customizing. Same issue.
So I look back at a few other websites I've installed this on and those files have the DOCTYPE in them and the search works fine.
Hmm... I says.
So I check the webserver OS. The problem child is on a server with the PHP version 4.3.1. The other installs are on older versions of PHP (4.2.3 and 4.0.6).
Now I'm a bit perplexed as to how to tackle this issue and problem solve it. Should I read the changelog for PHP to see what if anything might be amiss? Or could the issue be the Apache module? I don't know what version of Apache each server has. How would I find out if phpinfo() doesn't tell me?