Zen Lightbox addon [Support Thread]

[yellow1912]

Or, some installed mods on the site added an additional column to the table,

[Alex Clarke]

Or, some installed mods on the site added an additional column to the table,

Good thinking.

I would recommend installing a clean version of Zen Cart 1.3.7.1 and then comparing both (from the fresh install and your existing install) of the configuration_group tables.

Like yellow1912 said, the table may have been modified. So, check to make sure they both contain the same amount of columns.