I have a hard cover book by Tanith Lee," Personal Darkness" I have tried entering it several times and it keeps showing up as a paperback.. and I have a hardcover mystery by Robert Barnard, 'The Skeleton in the Grass " that comes up as a Board Book, what is that ???  I checked the ISBN's and am putting them in correctly..

Sometime the info in the system is wrong.. other times... an ISBN gets reused by the publishers for a different printing (hence the hardback/paperback incorrectness).  When you have one that isn't coming up correctly, the only way to enter it correctly is to add it as a book without and ISBN.

OK , but what happened to the little "IS THIS YOUR BOOK" question that used to pop up when you listed a book that gave you an option of choosing the correct book style. and what is a board book, I read a lot and haven't ever heard that term before.

Well, Wikipedia says a board book

...is a type of book published on a hard cardboard. This cardboard is used for the cover as well as the pages, unlike a typical book with cardboard binding and paper pages, and is intended to be more durable. Books intended for small children to use and play with, as well as luxurious editions of regular books, are often boarded.

However, I've also heard the term used for hardcovers, as the term Boards is used to refer to the covers:

Boards - the stiff part of a books bindings, the front and back  covers.

http://www.rarebooksource.com/bookterms

http://www.djmcadam.com/antiquarian.html

http://www.alibris.com/glossary/glossary-books  (also says "boardbook" is a children's format with heavy cardboard pages)

When it's an adult book, board book means that it's a hardcover that has a glossy printed cover that is identical to what is printed on the dustjacket (if there is one). They look the same with or without a dustjacket. The ones I've bought have generally been UK-published mysteries.

"Is This Your Book" is still there, but it only shows the ISBNs that the database knows are linked to the title you're posting. Your title probably just doesn't have any. In any case, you can't use that just to switch to a different binding type; it also switches to a different ISBN. The binding, ISBN, author and title all have to match in order to use an existing listing from the database.

It sounds like you'll have to post both your books without ISBNs.