We just got the WorkCentre 3615 and we got some issues with our SMB scanning.
Since scanning through the network is the fastest way to scan I've set up the SMB to scan to a network shared folder on a windows 7 ultimate pc.
I've tried setting up the printer to access through SMB the folder without login/password, through port 139 or 445, directly to scan folder or to a subfolder, but I get the same result all the time.
Scanning works after the initial setup, but stops working after a few hours of no usage (usually overnight). It just gives the SMB Scanning Login Error 031-522
Everything is accessible over the network from other computers... After I refresh the settings on the WorkCentre and go through the computer settings again, it starts scanning again for a certain period of time, until later after it starts giving the problem again.