Actually, I didn't explain that quite as clearly as I could have. I backed up up my main gaming rig which is indeed running Windows 7. I made an image of the PC and stored it on the NAS. In fact, it went direct from PC to NAS. Upon rereading my post, I realized it sounded like I reimaged the PC which was not the case.
As to the rest of your query, I did all the basic troubleshooting. I got nowhere. So, I waited a couple days and did it again, just to make sure I didn't miss anything. After another few days, I went through it again and posted here. As I said, I've been working in IT for 20 years and I know how easy it is to miss the simple things so that's why I went through the troubleshooting a couple times before posting here.
I did as you suggested and enabled the ftp server but was unable to access via ftp. I ran the disk checking utility on the NAS mgmt software (again) and it found no errors.
I just now rebooted the NAS via the mgmt software (for like the 10th time) while writing this response and lo and behold, this time it decided to work. What "fixed" it, I do not know but while I have it online, I'm going to copy everything over to my FreeBSD NAS and I'll start looking for a new enclosure to replace this one, I no longer trust it. I do wish I could put a 10 Gig interface on the D-Link because I do have one on the FreeBSD box and a few sfp+ multimode cables on hand. While I only have about half a TB of data on the device, it would certainly copy a whole lot quicker at 10 Gig than at 1. Oh well, you can't have everything...
Thanks to everybody who tried to help me on this. I appreciate it.
Can I assume you are still using win7 on your computers and was it only one of them that you reimaged?
I also assume that you have checked for such things as the NAS and computers are in the same workgroup (we have found that win7 defaults to homegroup when there is no domain server)
As a test to see if there are any problems with the drives in the NAS, enable the FTP server (if you haven't already) and then use something like FileZilla to log on to that server. You should then be able to see the files and folders for the defined user/group. If you can't see any files/folders then there is usually a problem with the user/group settings. That problem will have to be solved first.
I will say it is generally the simple things that cause the most problems usually because we are 'sure' that they haven't changed so we don't look at them. I learnt that the hard way when I started in computing with punched cards and in many ways what applied then applies more today. (example: we had one client that had such things as NAS boxes and network printers setup on fixed IP addresses although the computers were on DHCP. For some reason they changed the router that had the DHCP server and everything with fixed IP couldn't be found - not so strange because the new router gave out IP addresses on a different subnet. Their IT guy couldn't find it because he 'knew' the DHCP server worked therefore it had to be something else. It wasn't until one of my guys got there without any preconceived and followed our check list that the problem was found and rectified). There are times when I think that us professionals are our own worst enemies because we just 'know'.