mindexplorer

Until a couple of days ago I was able to download and play podcasts on my NH600D. I had to upgrade to SS 4.0 so some files would play ungarbled. It worked fine for a couple of days but now it won't let me load the podcasts, even ones I loaded on it 2 days ago. I just get the message "Transfers are not allowed." What am I most likely doing wrong or what has happened?