I have been using digital editions for years on my Mac w/my Nook. Today, I plugged in my nook to load on some new library books and the books won't open. I get the following error message: "Error getting License. License Server Communication Problem:E_ACT_NOT_READY." This keeps happening. I restart the computer. I restart my nook. I uninstall and reinstall ADE. Finally, I try unauthorizing it and get the following error message: "Unable to erase authorization. Please try after some time." Well, I've been trying. Nothing. Any advice?