There is a problem when doing a clean install of 1.5dev in that the blocks are set up before the module tables are but some of the blocks code apparently requires the existence of some module tables. For example one gets the error messages:

SELECT * FROM mdl_glossary WHERE id = ''

Table 'jiscmoodle.mdl_glossary' doesn't exist

SELECT cm.*, m.name FROM mdl_course_modules cm, mdl_modules md, mdl_glossary m WHERE cm.deleted = '0' AND cm.instance = m.id AND md.name = 'glossary' AND md.id = cm.module AND m.id = ''