After migrating to 1.7, events that were created by one teacher, can't be edited by another. I found someting in calendar/lib.php that corrected this, but it would be great if someone double checked it...

function: calendar_edit_event_allowed

1183 if ($event->userid) {
1184 if ($event->userid == $USER->id)

{ 1185 return (has_capability('moodle/calendar:manageownentries', $sitecontext)); + 1186 }

else

{ + 1187 return has_capability( 'moodle/calendar:manageentries', get_context_instance( CONTEXT_COURSE, $event->courseid)); + 1188 }

1189 } else if ($event->groupid) {
1190 $group = get_record('groups', 'id', $event->groupid);
1191 if($group === false)

{ 1192 return false; 1193 }

It worked for me, but I can't understand why this "else" didn't exist... maybe event->userid should get there empty?