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Forgot to mention - the site was designed on my development server, and it runs with no problem there. I did the chmod thing on the cache, templates_c, and uploads folders, FTPed the whole thing to my webhosting server, then changed the path and database settings in mainfile.php.
Both my development server and my webhost's server are running Apache. The path settings are fine - the production installation gets as far as the redirect to /modules/news before going to the blank screen. I've tried all the fixes for blank screen problems in the Wiki that seemed like they could be even remotely relevant.
phédre