I thought this problem might be related to the SMB issues that everyone is having in 10.6.3, but I've tried most of those SMB fixes and nothing works. Here's what happens, I have a shortcut to my Win 7 share, I launch it and a window opens, drive shows up on the desktop and sometimes icons show up sometimes they don't. Trying to copy anything is out of the question, the copy will just fail. Even going through the finders GO menu will screw it up. I am currently directly connected to my PC, was connected through a switch before, made no difference, nor should it. Strange thing about the windows box is that it will be responsive until I try to open anything, and then it will just go into an infinite loop and require a hard reboot. I did briefly get it working, enables the smb.conf extensions off item, did a repair disk, did a full onyx clean and somehow it worked for a day. Now it's totally hosed again. And yes, this started happening right when I updated to 10.6.3!