Well here is the solution:
I noticed that the page displays correctly and allows you to edit and save when you follow these processes (tested in Firefox and IE):
- Go to the Share Site
- Click on 'Wiki'
- Click on 'Wiki Page List'
- Click on 'Course Plan'
OR
- Go to the Share Site
- Search in the top right search field "Course Plan"
If you edit the page from here, it saves without an issue. All other methods of accessing the course plan wiki page (that I tried) do not show the text from the wiki page and do not allow you to save the page. So this is a work around which should allow things to work.
The original bug remains. Hope this helps someone (or Alfresco looks into it)