It is impossible for students or teachers to visit the 'Site home' page when Default Home page for users is 'My Moodle'.

Users are directed to My home as expected with this being the preference in the Navigation block and Navigation bar. When users click the 'My home' link (URL: http://example/?redirect=0) it returns to http://example/my' rather than 'http://example/'

When the Default Home page for users is set to 'Site' or 'User preference' the two links work as expected.
I've got debugging on to display full developer messages and no error is presented. I cannot test this in demo.moodle.net as it is currently on version Moodle 2.1.1+ (Build: 20110817)

Replication steps:

1. Log in as Admin go to Home ▶ Site administration ▶ Appearance ▶ Navigation
2. Set "Default Home page for users" to 'My Moodle'
3. Click the 'My home' link - result: you are presented with your http://example/my page as expected
4. Click the 'Site home' link - result: http://example/ page as expected

1. Log in as Teacher or Student
2. Click the 'My home' link - result: you are presented with your http://example/my page as expected

1. Click the 'Site home' link
   Error: you are returned to http://example/my
   Expected result: you should be returned to http://example/