Please help us by providing the following info. Before posting please also check the pinned "Known issues" threads and make sure that you're running the latest available version for your oC release: https://owncloud.org/changelog/
Steps to reproduce
1. LDAP user authentication
2. One member of group (on LDAP) share the folder (to this group) and other members add there files and folders there to be visible to others
3. Other members of the group add collaborative tags on shared files and folders
4. Each user can view and search only the tags created by him. User does not see tags created by other users.
All members of group should see tags created by other users on files shared to group
Users of LDAP group can view only their own tags.
If users are created as owncloud local users and are members of owncloud local group, tags are visible for all members of local group on files shared to group.
Operating system: FreeBSD 9
Web server: nginx
PHP version: 5.6.16
ownCloud version (see ownCloud admin page): ownCloud 9.0.7 (stable)
Updated from an older ownCloud or fresh install: updated from 8.2.9
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): LDAP authentication
ownCloud log (data/owncloud.log)
Integrity status for oC9+
No errors have been found.