I've always mapped my runtime drive to the same drive letter on each machine so that even if it does save something with an absolute drive refence it works from machine to machine. I find using drive letters that are hard to reach work the best. In other words Drive G or later in the alphabet in case Winodws uses up ther first few with mutiple hard drives and other devices. Now that we have all these memory card drives as well, the further down the alphabet you assign the easier it will be to maintain. If you're having trouble saving across the network, you might want to make sure you have all the permissions on the drive set properly.