I was working on setting up a role migration from Drupal 6 to Drupal 7. After some time, I noticed that the role id's were not being preserved, which was going to cause a problem for me when I went to take the migration to the live server. I initially tried using the addFieldMapping function to link the source rid to the destination rid (similar to preserving the nid for nodes or the uid for users). However, this failed to save any of the roles during migration.
Today I was working on an intranet site using Open Atrium. Our client wanted to post their employee handbook on the intranet using the atrium notebook module. The problem is that, by default, all authenticated users are able to post a handbook item. Obviously, this wouldn't work with an employee being able to modify the employee handbook online.