Is your "nook for mac" broken after upgrading to Mountain Lion?
Barnes & Noble offer very usable software to purchase and read ebooks (nook books) on a Mac laptop or desktop. However - it hangs after upgrading to 10.6.8 or higher. This is a very vexing problem and Google documents nothing but frustrated threads. i have found a remedy:
1. Go to Documents and open "My Barnes & Noble eBooks" and remove the folder inside (labelled with your email address by B&N). This folder has all your purchased nook books in it. Save it to your desktop or anywhere safe - you will put it back later.
2. Download "Easyfind" - a very safe and functional search device which locates ALL system files. Install.
3. Using Easyfind, locate all folders & files named "nook" or "Barnes" and trash. You can do this using Spotlight but it is really hard compared to Easyfind and you might miss something.
4. Download B&N nook for mac zip file from their website (you want the latest one) and install it. While you are downloading, "sign in" to your Barnes & Noble Account and leave it open.
5. Replace that saved folder (your email address is it's name) in "My Barnes & Noble eBooks" in your Documents file.
6.) Open that folder and right-click a book (.epub will be the end of the name) and mouse-over "open with" then click Nook_For_Mac.app
7.) This should launch Nook - it will prompt you to re-register. Do so.
Everything should work fine in Mountain Lion after this (or even Snow Leopard 10.6.8).
Nook For Mac is REALLY nice ebook reader EXCEPT for one thing - it "Phones Home" to B&N ALL THE TIME! I am pretty sure this is why it hangs so easily. It is very unwilling to "just work" unless it can call home base first and sync it's cloud.
Hope this helps - I went to a great deal of trouble to figure it out!