A while a go I updated my test server with the Apple Security Update 2005-001 and after that my MMCache stopped working. PHP has been updated and that requires a recompilation of MMCache.
Update: You can download a pre-compiled version of Turck MMCache for PHP 4.3.10 here. Copy mmcache.so to the directory /usr/lib/php/extensions/no-debug-non-zts-20020429
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The binary is removed. Can you provide the binary on your site?