Thanks for the bug report.

Prior to UBB.threads 7.7.3, the following was hard-coded in to all searches.
Code
{$config['TABLE_PREFIX']}USER_GROUPS as t4
USER_GROUPS is now only used in the query if you perform a live query with the "Advanced Search Options" and have selected a group.

Your saved search also contains USER_GROUPS in its filter.
This is what's triggering the error. And I am able to reproduce the error.

Give me a day or so to push a fix in to the code, and post a temp fix for it to this thread.

This error only affects version UBB.threads 7.7.3.

current developer of UBB.threads php forum software
current release: UBB.threads 8.0.1 // wip: UBB.threads 8.1.0
isaac @ id242.com // my forum @ CelicaHobby.com