SharePoint Managed Metadata Missing Values
If you are using managed metadata within your SharePoint farm and begin to experience an issue where only the site collection administrators can view the terms in a list it could be because the permissions within the “secret” taxonomy hidden list are not set for all users.
Within each SharePoint 2010 site collection, there is a hidden taxonmy list located at the following URL replacing (yourhostname.domain.com/yoursitecollectionname) with your information:
http://yourhostname.domain.com/yoursitecollectionname/lists/taxonomyhiddenlist

For your customers to be able to see the managed metadata terms within any of the site collection lists, they will need to have at least “Read” access to this hidden list. Permission to this list must be configured by a site collection administrator and can be granted like others list in SharePoint.
First click on the List tab under List tools, then click on the List Permissions button on the right side of the ribbon. Find a group that has at least Read permissions and click on the name. Now add the group/person by clicking on the New button > Add Users. Search for the group/person and click ok when complete. Those added should now be able to see the managed meta data terms in all lists within the site collection.