You are correct that auto-unprotect should make HiDef content decrypt in the process of downloading (StDef will decrypt without it), but I am not sure why the download hangs for a file that has to be decrypted on the fly but not for a pre-decrypted file. There ought to be no difference. A file will not download until it has been indexed - you do have the DLNA icon listed with the file name? However, I have had this trouble with IE8 and when I want to download I use the wget command line utility. You will need the DLNA URL, available from the information panel that pops up when you click the file name in the WebIF media browser.