IBooks in Maverick will not open / download

Question

Since upgrading to Mavericks yesterday, I cannot access the majority of my iBooks on my Mac. I can see that the majorioty of my iBooks are showing in my iTunes library under iTunes/iBooks.
All barring 5 books have a cloud symbol in the top right of the books. When I click on the book to read the download symbol appears & the progress bar across the bottom of the book moves across & looks like its downloaded. But the book does not open. In the top right hand corner of the iBooks app is a download arrow, if i click on that it shows downloads available i.e. the book I am trying to read, but the open button is greyed out & nothing happens if I click on it.
If i go into the iBooks store and click on purchases it show sthat i have no purchased books to download, but when i click on the All tab it shows all my books, but when i try and click on one it opens up teh page & there is a read button. When i click on read, you can see it attempting to download and again In the top right hand corner of the iBooks app is a download arrow, if i click on that it shows downloads available i.e. the book i am trying to read, but the open button is greyed out & nothing happens if I click on it.
I have tried transfering purchases from my iPhone & iPad (as all my books on on both) and this hasnt doene anything. Ive tried signing in & out & thats donew nothing. In fact 4 books are missing from my physical library & everytimne i try and download from iBooks it states download failed, tray again and check available downloads from iBooks store, but when i do this is says i have no books to download.
Is there any way i can complete trash the iBooks library file, so that it will rebuild itself from the actual files on my Hard disc.  I have been able to do this with iTunes before.
Basically the App is useless to me as i cannot ready 95% of my iBooks.

Answer 1

I have a solution which works for me, but its a pain if you have a lot & lots of e-books.
Make sure iBooks is closed & everything is backed up (a separate copy of your original iTunes books folder with all your books etc would also be useful. I titled mine 'e-book copy').
Go to Spotlight in top right hand corner of your computer & type in iBooks, you should see a folder called iBooks, lick on it & it should open a new finder window.
This it seems is your iBooks library @  ~Library/Containers/com.apple.BKAgentService/Data/Documents/ibooks
I then deleted the iBooks folder completely.
I open the iBooks App. I then search for iBooks again (in spotlight) & see that a new folder has been created as above in the library, I then look in that folder & there is a folder titled books, open it & it should be blank.
In the iBooks App I can see that most of my books are there with the iCloud symbol just as before.
1) - Click on iBookstore in top left of the App. Then click on purchased under the quick links section (making sure you are signed in).
2) - It shows that I do not have any books in my library to download (which is wrong as all my books have the iCloud symbol).
3) - I then clicked on ALL and you should see all of your purchased books.
4) - I start at the top left & click on the 1st book, it opens the iBookstore page for that book & I then click on the read symbol. This then downloads the book & opens the book for me to read. I  then close the open book.
5) - If I go back to the books folder in the library  i.e. ~Library/Containers/com.apple.BKAgentService/Data/Documents/ibooks/books I see that a folder has been created titled with a set of numbers& epub i.e. 123456789.epub (this is the folder for the book you have just read / opened / downloaded).
6) - I open that & click on the file titled iTunesartwork & this shows the cover of the book I just read / downloaded. 7) - So now I know that iBooks has downloaded a new copy to my machine.
Back in iBooks, click on the library button & you should see the book in your library without the iCloud symbol & you can open & read the book within teh iBooks App
I had to do the above steps - 1 to 7 for each and every book in my library which took a long time.
Eventually ALL books were downloaded as they should have been originally.  For PDF's I simply in iBooks went to Add to Library, found the PDF in my e-book copy folder and imported.
This worked for me, not sure if it will work for everyone. But I now have all my books synced across all devices