Each call to role related stuff seems to cause a notice. I was logged in as an administrator, don't know if that makes a differnce. Here is an example (but there are loads on every page):

( ! ) Notice: Undefined index: mod/tracker:manage in /var/www/moodle/learntest/lib/accesslib.php on line 4731
Call Stack

1. Time Memory Function Location
   1 0.0023 165788 {main}

   ( ) ../view.php:0
   2 0.3702 13239916 include( '/var/www/moodle/learntest/mod/tracker/views/admin_summary.html' ) ../view.php:247
   3 0.3794 13243128 tracker_getadministrators( ) ../admin_summary.html:67
   4 0.3795 13243128 get_users_by_capability( ) ../locallib.php:731
   5 0.3852 13258536 has_capability_from_rarc( ) ../accesslib.php:4576

Tracker version, 2008092604