Photoshop/Bridge CS4 problem with AFP shares

Question

Hello,
I have recently purchased Photoshop CS4 and encountered the following problem: when opening images from a NAS share connected via AFP using File/Open command, Photoshop will correctly display the list of files but Open command in the File open dialog remains disabled after a file is selected from the list.However, I can open the same file by dragging and dropping it from the Finder to the Photoshop Dock icon or later using the Open recent menu command.
Similar problem is visible in Bridge: it will not display the image thumbnails from any of the subfolders in the network share.
I am using Leopard with the latest updates, I have a read/write permissions to the network share and Photoshop/Bridge are the only applications that have problems browsing/opening files from the network share. The NAS unit is a Synology DS-107+ with the latest official firmware.
Futhermore, I have noticed that I can work around the problem by opening the same directory in Finder. After the image thumbnails are visible in Finder, both Photoshop and Bridge will correctly open all files in that directory but opening files from other directories still has the problem.
Does anyone have any idea on what might be causing this strange problem?

Answer 1

This is the boilerplate text I use in connection to saving to a network (please NOTE the part where it explains that normally, it does work, but that it is impossible to troubleshoot someone else's network remotely, and that's why it's not supported by Adobe):
If you are opening files over a network or saving them to a network server, please cease and desist immediately in the event you are currently experiencing problems with one or more files. Working across a network is not supported.
See: 
http://www.adobe.com/support/techdocs/322391.html
  Copy the CLOSED file from your server to your local hard disk, work on it, save it again to your local hard disk, close it, and copy the closed file back to the server.
     Of course, the fact that Adobe does not support working across a network does not necessarily mean it won't work.   It should.
    Adobe's position is that there are too many variables in a network environment for them to guarantee that everything will work correctly in every network, especially given the fact that if something does not work properly, it's probably the network's fault, and Adobe has no way of troubleshooting your network.
  If you can't work locally, you are on your own, and if something happens, you're on your own. If you must work from a server, make sure your network administrator is a competent professional.
When problems arise, a lot of valuable work can be lost.