Clicking Register in /explorer page does not show course in /explorer/courses

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What steps will reproduce the problem?
1. Create a course with data saved in the datastore (example: 
course:/algebra::gcb-algebra)
2. In the main explorer page if a student click the register button but the 
page /explorer/courses does not show the student as registered.
3. The student can acces the course as example.com/algebra

What is the expected output? What do you see instead?
The course should appear in the /explorer/courses page and dissapear from 
/explorer

What version of the product are you using? On what operating system?
GCB 1.5.1, Windows 7 64Bit, sdk 1.8.1

Please provide any additional information below.
As I said the student is registerd, no problem, but the course does not 
dissapear from /explorer page.

Original issue reported on code.google.com by onel.and...@gmail.com on 3 Jul 2013 at 3:55

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Original comment by r...@google.com on 4 Feb 2015 at 5:48

• Changed state: Accepted
• Added labels: Priority-High
• Removed labels: Priority-Medium