Hello,
I'm expiriencing same issues with band new WorkCentre 6605.
I'm using Win 7 x64 with newest (downloaded) TWAIN drivers. Printer is connected to local network (same switch).
I'm trying to use "Fax and scanner" and "Scanners and cameras" utilities from Windows (not sure about exact names of utilities, i don't have english Windows).
In "Scanners and cameras" utility, in WC 6605 Scanner properties I also see "State: Not connected".
Do you have any suggestion?
PS: I will try scanning over USB soon and ley you know if it's working.