New Samba Problem

I’ve gotten Samba working on my Fedora server, and I can see and read files on it from my Windows 2000 box, and when I first got it working (I had a firewall problem) I could even write to it. But now when I try to drag files to it, or save them from an application, I’m getting an error that indicates a permission problem. I can’t imagine what it could be, since the files and directories are all write permission for the user, and I’m the user. I can write to them as a user on the Fedora box itself–I just can’t do it from the Window’s client.

Anyone have any ideas what could be the problem, or how to diagnose it?