Topic: 10.4.6 clients dropping 10.3.9 server home folder

For over a year our school had many 10.3.x clients authenticating against a win2k AD, and then finding their home folders via AFP on an OS X server 10.3.x. Worked very, very well. Now we upgraded one lab of our clients to 10.4.6 and the process breaks. What happens is now a student will log on successfuly (against the AD), their home folder will connect. In the finder they will be able to go to their document folder or their desktop or where ever and all is good. Then they run apps. Now their "Documents" folder in the left edge becomes un reachable. If they opened a file from there, then try to just save again, it will say the file is locked. However if the use the "Network", then "Servers" then specific stuff they can still see their home folder, and then their documents folder and can save a new copy of their document to the server! For 90% of the students this means they cannot work. It's too many steps. I can't even get my staff to follow the Network>servers>studentserver>share path. Especially the save while working being broken. It loses most of them. Please help! (Yes I posted this to Applie forums, but no one is helping over there!)