Problems opening and saving PNG over network with CS2 and CS3

Question

using os10.4.11
photoshop CS2 or CS3
I've recently tried to save images in PNG format,  small (no more than a couple hundred kilobytes) and found that whenever I tried to save to the server it would hang photoshop and require a force-quit. Saving the same file to the desktop works fine. Copying said file to the network and then trying to open that PNG from the server results in a photoshop hang, while opening that same file from the desktop works fine. I know all about the fact that Adobe doesn't support working over a server, but that's never been an issue at my workplace in all the years I've worked with (never had problems saving/opening any format, no corrupted files ever). If I try to open that same PNG from the server with CS2, same result. If I try to open it over the server using Photoshop CS, or version 7, however, it opens just fine. If I copy the Photoshop CS version of the PNG plugin and replace the PNG plugin installed with CS3 by default, then it seems to work and I can now open and save PNGs anywhere with no problems. Has anyone else had this problem? I can see that the file size of the PNG plugin has changed version to version, so something about it has changed. It seems as though there is something defective about the ones installed with CS2/3, and just copying the CS version into my CS3 folder clears up the problem.
Also, the problem is not limited to my computer. Other macs that try to open PNG files from the server using CS3 or 2 also hang.

Answer 1

Yes, we're a prepress company moving around probably a few dozen gb of data per day, saving PSD, TIFF, EPS, JPEG, all kinds of formats. It's the first time I've had a client requesting PNG files, and so the issue has come to light. This is the first time I've ever seen any kind of issue opening/saving across our network in 8 years. (the only time I've ever seen a corrupt file was a 1.6gb image that didn't copy correctly, and that wasn't a photoshop-related corruption, but an OS drag/copy of the file)
I'm not sure if I'll be able to find someone with OS 10.5 or some other version to see if they cause problems. If anyone else reading this who works over a network can test a PNG open/save over their network and list their OS and Photoshop version it may help. I'm going to see if I can find some other computers to try it out on in the meantime and mention it to IT.