A work around for those running VB 4.2.2 and 4images 1.7 seems to be if you copy functions_navigation.php from your vbulletin /includes directory to your 4images /includes directory.
This fixes the fatal error and restores the ability to user the vbulletin user table for 4images
You will get the same error when trying to login to the 4images admin. To fix with the workaround, create a new directory in the admin folder called "includes" and copy functions_navigation.php to it
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