Nook Samsung by Tablet sort by Author

I recently got the Nook Samsung Tablet. While it's great, it doesn't allow books/files to be sorted by author, only by title.

I use Calibre with my fanfiction, and so was able to reverse those titles/authors to get them to sort the way I wanted on my Nook. I noticed though, that a couple of titles had been changed. I went to Calibre to fix the titles by hand, and ran into a huge problem.

If the title has the word "with", that word is automatically changed into "&".

So for example, "The Problem with Purity" became "The Problem & Purity."

Something with the author sort is causing this I think, because I would change it in both the author and author sort fields, but the author sort field kept turning red even though both fields matched.

I've tried...
(author --> author sort)
* "The Problem with Purity" gives me--> "Problem, The & Purity." When I change the & to "with", the field goes red, and the changes don't save when metadata is closed. Reopening shows the author is also changed to "The Problem & Purity" as is the author sort

* The Problem with Purity --> Purity, The Problem with (author sort field is red, and changes aren't saved when metadata is closed, reopening shows it changed back to "&", this time just in the author field)

Help?
(It works just fine in the regular title fields, but I need title/author reversed to organize it on my nook)