This is a recurring error. Upon uploading WP 2.0.3 to my server, my ftp client hangs in the middle of the wp-includes folder, and returns an error: "Can't establish data connection for file xxx.xx"
This is persistent, across multiple attempts, and on multiple servers. I've tried two different ftp clients (Transmit and Cyberduck, both on OSX) and get the same error with both.
Any thoughts?