Using Moodle 2.6.1+ (Build: 20140207)

On the Recent activity page,

1.- the following error is issued:
You need to update your sql to include additional name fields in the user object.

line 3570 of \lib\moodlelib.php: call to debugging()
line 926 of \mod\quiz\lib.php: call to fullname()
line 171 of \course\recent.php: call to quiz_get_recent_mod_activity()

2.- And this other error is issued specifically for Glossary and Quiz activities:

Missing firstnamephonetic property in $user object, this is a performance problem that needs to be fixed by a developer. Please use user_picture::fields() to get the full list of required fields.

line 196 of \lib\outputcomponents.php: call to debugging()
line 2254 of \lib\outputrenderers.php: call to user_picture->__construct()
line 941 of \mod\quiz\lib.php: call to core_renderer->user_picture()
line 258 of \course\recent.php: call to quiz_print_recent_mod_activity()