Renaming a book and quil in an anvil makes it so you cant write in the book.
Steps to create bug:
1.Get a book and quil
2. Rename it in an anvil to anything.
3. Then try to write in it.
NOTE: I did this in multiplayer bukkit 1.6.2. I dont know if it makes a difference but I thought i should mention that.
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Bukkit isn't fully completed for 1.6.2 quite yet. They are still developing the code and fixing bugs and stuff (this, for example), so it's going to have bugs.
Trust me. I've used Bukkit dev builds before, and have paid the price once or twice.
My suggestion is: Stay in the most recent Recommended build (which is currently 1.5.2), and wait for a Beta build, at least (they are usually less buggy, but still not complete).

This issue is invalid. It relates to a modded or 3rd party client/server.
To report an issue, delete mods, and do not report issues of servers with plugin.

@Enzo Candisani
This issue is invalid. It relates to a modded or 3rd party client/server.
To report an issue, delete mods, and do not report issues of servers with plugin.
That all was already said and the ticket resolved. Please comment only if you have something to contribute to resolve a ticket.

Can't write in Book & Quill Because when hitting done and the reopen it. There nothing write in it
This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded Minecraft.