Print to PDF Option Gone after Upgrade

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I'm sure it's a local problem within my installation, rather than a bug. My best clue seems to be the log entry:

ERROR: AppParam templateEntityTypeList:...

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It appears to affect all entities.
Created new templates, cleared cache, rebuilt, reloaded page, restarted espo and server....
Still no print...

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After upgrading Espo from 7.1.9 to 7.3.2, the print-to-pdf feature has disappeared. Server is running Ubuntu 20.04, and was running php 7.4 at the time...