I have iMac with OS 10.6.6. Just recently whilst downloading I am getting many messages "Warning: unresponsive script" popping up in the download window. It stops any downloads & offers 2 options, either "stop script" or "continue". I usually choose the "stop script" option because it gets the downland going again. I've occasional had this happen in my browser but I think adding more RAM would sort that out. Also this information comes up as well, "Script: chrome://mozapps/content/downloads/download.xml:68". Hope there is an answer.