For testing this issue:

1. You need to have access to console on your system
2. Curl and python should be installed on your system.
3. Have basic understanding of Json

Test

1. Run following command from your console

   curl 'http://qa.moodle.net/webservice/rest/server.php?moodlewsrestformat=json' -H 'Pragma: no-cache' -H 'Origin: file://' -H 'Accept-Encoding: gzip,deflate,sdch' -H 'Accept-Language: es,en;q=0.8,de-DE;q=0.6,de;q=0.4,nb;q=0.2' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1798.0 Safari/537.36' -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' -H 'Accept: application/json, text/javascript, */*; q=0.01' -H 'Cache-Control: no-cache' -H 'Cookie: MoodleSession=6jl8pbg3ndu6j70h4a56k0aea4' -H 'Connection: keep-alive' --data 'wsfunction=core_webservice_get_site_info&wstoken=d49d1fac7125d9fd515c374be8d37c34' --compressed | python -m json.tool

2. Verify you get details about Sam student
3. Confirm that the settings values are the same than in the Moodle interface
4. Do some changes on qa.moodle.net for Sam student
5. Run above command again and ensure changes are visible.