I imported data from the FAQMAN plugin but now the old autotags no longer work. What happened?

When importing new IDs are generated. As of version 1.0.2 of the FAQ plugin there is a patch in the autotag function that you can enable setting $_FAQ_CONF['faqman_autolink_patch'] = true in your FAQ plugin config.php.

You should not do this if you do not have old faq autotags since it might affect performance slightly.