Firstly Greetings to you all

Nice to be here.
I am needing some insights from the wise ones
We are running SME 8.1
I have an issue with 3 Mac machines accessing shared files on our ibay.
The 2 newer ones have OSX LION 10.7.5 and OSX 10.9.4 and an older one which is running OSX 10.6.8 which logon using SME user /pass
They can all create folders and files and yet a quarter of time lose ability to change move or have the other Macs access their files and folders.
It seems as though the authentication is dropping off in an intermittent fashion
Also the older Mac has no problem searching on these ibays using Spotlight yet the newer 2 cannot.
I would appreciate any thoughts you might have as to why this is happening.
Cheers
