During a backup/restore into new course I get a couple notices:



ERROR: invalid input syntax for integer:



SELECT * FROM mdl_quiz_categories WHERE course = '' AND stamp = 'mltest.wgtn.cat-it.co.nz+050811024546+1wCLMJ'



and then later on



Restoring quiz without user attempts. Restoring of user attempts will be implemented in Moodle 1.5.1



(but it's 1.5.2+ already!)