I just finished creating a solution (or updating an existing solution) and after moving it to FMS Server 7 Advanced a new feature I've added to look up user has stopped working.

After watching the "Companies, Contacts & Details - Optimizing your data" from ISO FileMaker Magazine I included in my solution the ability to type all or part of a users name in a Global field, then pressing tab should show only user containing what I typed. This is done with a portal and 2 calculation fields.

If I have the database open local from my computer this feature works perfectly but if I open it remotely from FM7 Server (version 7.0.1) it does not work.

Any guess as too why hosting the file would make this top working? I will try upgrading the Server but any other guesses suggestion would be greatly appreciated.

It's the global field. There are differences if you host the file on FMS. Just search for "global" in the FileMaker help and read the section "Defining global fields (fields with global storage)"