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menu_breadcrumb sets drupal_set_breadcrumb within hook_init. uc_catalog fires drupal_set_breadcrumb at hook_nodeapi. Altering the module weight for menu_breadcrumb has no effect, because hook_init always fires before hand. This patch sets the breadcrumb at the last possible level, before node view, to give it the capacity to be the last/heaviest (highest precedence) influence on the breadcrumb.