no idea what version to which this applies as i’ve never installed or configured gallery2, but here’s the process by which i just now debugged one particular gallery2 install…
gallery2/config.php
line 30 - @ini_set(’display_errors’, 1);
line 134 - $gallery->setDebug(’buffered’);
1st error:
Unknown column ‘g2_Item.g_renderer’
grep -r ‘renderer’ *
modules/core/classes/GalleryStorage/schema.tpl:
CREATE TABLE DB_TABLE_PREFIXItem(
…
DB_COLUMN_PREFIXownerId int(11) NOT NULL,
DB_COLUMN_PREFIXrenderer varchar(128),
ALTER TABLE g2_Item ADD g_renderer VARCHAR(128) NULL AFTER […]

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when mixing standard selects containing table aliases with LEFT JOIN’s you need be aware of a critical change as of mysql 5… if you reference a table alias in an ON clause the same way you might have in verison 4, mysql may report an ‘unknown column’ error.
so, a query of the form:
SELECT a.id FROM […]

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