I also had the read/write permissions problem when tranferring a large amount of data.
This problem is solved by doing the format of md4 like in the troubleshooting section.
But I still have one problem.
After a few days Windows can't reconnect/map to the drive unless I do a reboot of the MB drive.
What I would like to do is formatting the md3 partition like explained in one of the forum threads.
But when I want to unmount I get a Device or resource busy error.
Can someone help me?