File sharing with FM 9

Issue report by Carlos Díaz Izquierdo

Product

FileMaker Pro

Version

9.0v3

Operating system version

MacOS 10.8.4

Description of the issue

We've recently migrated all our local network from Windows to Apple. We now work with Mountain Lion 10.8.4
I want to move a solution we have in Filemaker. The licenses we have are version 9.0v3.
We have one license working as a host for the files in the host and the other four in terminals accessing the files via Open Remote.

Steps to reproduce the problem

When activating Network Sharing in the host, I get an error: "FileMaker can not share files because another user is sharing files with FileMaker Pro on this computer."
There wasn't any other installation in the server and I even tried without LAN or internet connection.
I would like to know if there is any solution to work with version 9 (without upgrading).
Thanks for the help

Actual result

Appart from the message in the host, the rest of computers can't obviously see the shared files

Exact text of any error message(s) that appear

FileMaker can not share files because another user is sharing files with FileMaker Pro on this computer.

Workaround

I've tested with version 11 (trial) and appears to work fine..