If the teacher has a course set to separate (and I think visible groups) then they can view all the participants; however, it does not allow them to view groups properly (as I recall) and when the students try to view their grades they are unable. I recently fixed this in the GBPv2 and the patches are available at CONTRIB-105 and CONTRIB-109. Unfortunately, I do not have time right now to carefully dive into core's gradebook and would appreciate a little help since it seems to be affecting a number of users (see http://moodle.org/mod/forum/discuss.php?d=83861) for the most recent discussion. I believe Yu has done some similar work with the gradebook code in the past and hope that he (or someone else) might be able to get this patched in core. Peace - Anthony