[Araneae]

Hello, I have been having problems with Calibre and my Nook HD+. I am trying to edit the metadata of a book, but when I do so it does not load on my device.
Here are the steps I am taking:

Import a clean, DRM free EPUB into Calibre.
Right click the book, change title from "A Game of Thrones" to "Song of Ice and Fire #1: A Game of Thrones."
Change cover to a better cover while I am editing metadata.
After I am done and save the metadata, I right click, send to main memory of my device.
Open EPUB on device, get an error message: "Error Dialog - Sorry, cannot open this book."

I know this issue is with Calibre editing the metadata, because the book works if I do this:

Import the same clean, DRM free EPUB into Calibre.
Right click the book, change the cover to a better cover.
After I do that, I right click and send to main memory of my device.

The book works if I do that and has the better cover that I want and it works fine on my device. However the minute I try and change the title and send to my device the book stops working. Can anyone help me with this?