I bought a brand-new HD+ a week ago, installed MyNook on my iMac running 10.8, and I had no problem loading books on to it. Yesterday I installed it on my laptop running 10.9, and no joy. After two chat support sessions timed out, I emailed them my problem and received the following reply:
"we regret to inform you that as of now NOOK for Mac only supports iOS
10.6 and 10.7. But don't worry, We consider this issue critical to the success of our business, and have passed this along to the appropriate personnel for review." (yes, in those font sizes. I've no idea why.)
Now, since I am running it on OS-X 10.8, there's a disconnect here. The version that I just downloaded is dated before 10.8 released, so they've taken their sweet time updating it. I think it's a huge shame because I think the HD+ is a fantastic tablet for $150, and this is really going to crimp adaptation. I'll definitely not update my desktop, and I've been considering downgrading my laptop to 10.8, so we'll see what happens.
And if anyone has it working with 10.9, I'd love to hear how you did it.
B&N support does not understand what you are talking about.
MyNook (which you mention) installs the MTP drivers needed for Mac to transfer files to the Nook HD tablets.
Nook for Mac (which support mentions) is the ereader app for Mac to read B&N ebooks.
Someone on this forum in the past mentioned this app as an alternative for the MyNook MTP drivers:
If you Google Mac and MTP I am sure your will find other alternatives too.