I've updated the Grid format for Moodle 2.5 to incorporate a performance improvement and a bug fix when importing courses etc. Please get from https://moodle.org/plugins/pluginversion.php?id=3617:
- Fixed CONTRIB-4216 - Error importing quizzes with grid course format.
- Fixed CONTRIB-4253 - mdl_log queried too often to generate New Activity tag. This has been fixed by using the 'course_sections' table instead to spot when a new activity / resource has been added since last login.