After a roll out, admittedly this feature was not tested….The ability for users to add web parts to a page.

Cause:   Users don’t have read permissions on the Web Parts list. 

Add permissions to the Web Parts list.

 1.       On the top-level web site go to Site Settings in Site Actions

2.       Click the link Web Parts in Galleries. 

3.       Go to Gallery Settings 

4.       Set Permissions for this gallery

This environment for this roll out required restrictive permissions.