1.2.1 doesn't even have a mod/glossary/dynalink.php so I'd suspect a mix of old and new code ...
If it's happening in mod/glossary/filter.php then I'm at a loss ... there is code at the top which explicitly checks for the function existing already ... perhaps function_exists() doesn't work on all systems?
Installing and upgrading help
Fatal error: .... dynalink.php
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