Modifying course_template.yaml doesn't propagate changes to already created courses

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Change 
- institution 
    name: 'first-name'

2. Create a course
course:/first::ns_first_course
course:/:/

3. Change 
- institution 
    name: 'second-name'

4. On the page site.com/first the old name appears


What is the expected output? What do you see instead?
The name should have changed

What version of the product are you using? On what operating system?
gcb 1.5.0, gae sdk 1.8.1

Please provide any additional information below.
The file for each course is stored as binary. Could that be the cause ? 

Original issue reported on code.google.com by onel.and...@gmail.com on 22 Jul 2013 at 5:23