Guy,
I'm having an issue where when resuming from sleep, folders and files located on a Windows 2008R2 share are greyed out with an x... I seem to recall a fix for this (flushing network cache?) but my google-fu fails me.
Workstation is Windows 8 Pro (64bit), Offline files disabled, gigabit wired connection to small 8 port Dlink switch (same switch as server).
I don't see this behaviour on my Win7 laptop or Win7 kids desktop.