P: Book Module – Unfinished book vanishes

Yes, that's what I'm doing now (save in pdf) + I save manually my catalogue, so I can come back to the last saving if a problem occurs.
But now I avoid to edit images when they are in the book (If I have to do so I start to erase the image from the book, then reinsert it after editing); since this time I have no problem.

Yeah, but a lot of people might not upgrade, or delay upgrading because they do not know there is a serious issue.

Think about it. You sit down to work, have only a couple hours of time, and tons of ideas for your precious book project. You bootup Lightroom and the update screen pops up, what do you do you? hit 'update later' of course, because updating is time consuming, and you have work to do.

However, if people knew the risk they were taking by using the book module, then they would update right away.

The responsible thing for your company to do is warn people so they don't miss they update. you know there is an issue in 4.1. you have confirmed it. Please warn people. And please don't pass responibilty on the user who is unaware of the problem.

Yeah, but a lot of people might not upgrade, or delay upgrading because they do not know there is a serious issue.

Think about it. You sit down to work, have only a couple hours of time, and tons of ideas for your precious book project. You bootup Lightroom and the update screen pops up, what do you do you? hit 'update later' of course, because updating is time consuming, and you have work to do.

However, if people knew the risk they were taking by using the book module, then they would update right away.

The responsible thing for your company to do is warn people so they don't miss they update. you know there is an issue in 4.1. you have confirmed it. Please warn people. And please don't pass responibilty on the user who is unaware of the problem.

As noted above in the official answer are directions to upgrade to 4.2 and to avoid this problem.

There has been progress folks but just as a safeguard, export your book to PDF if only so you can have a copy to help should you need to recreate it.
Alternately, just take screenshots of enlarged thumbnails or spreads

I've been writing Blurb for weeks trying to get them to warn their users about this problem but they won't. Of course Adobe should warn people too...

Unfortunately, it seem these companies are more concerned with damage control than trying to do what is best for customers.

Sorry about the incident, happened to me too, it sucks.

Also check to see if you have a backup catalog, maybe that will have an old version of the book.

Lightroom V4.1, I lost my book.
(Sorry for my bad English, I'm French)
I worked a full day making a professional book and suddenly, by switching from the development module to the book module all my book (a full day work) was gone! I used to duplicate it from time to time but even the duplicates books were lost.
For your information, in case if it helps, I use mixed files formats for the book photos: jpg, raw, dng and even tif because I use sometimes the Topaz Adjust plug-in.
And there is no way to save the book outside Lightroom while working, nether to print or save a double page layout to remember the layout in order to make the book again.
The book module is fantastic but thank you for resolving this very big issue as I use it for my work.
Best regards,
Philippe

While using Lightroom 4.1 on Mac, I created a book with 240 pages - Std Landscape, which took several hours. I saved the book. I then attempted to edit one image from the book in the Develop Module, and then Lightroom would not go back to the book module.
I quit LR4 and when prompted to back up the book, I did so.
Upon relaunching LR4, all 240 book pages had dissaperared, but the filmstrip at the bottom was still present.
Please can you help as this has taken many hours and I need to get the book sent to Blurb as soon as possible. Many thanks.

I have been creating a book in Lightroom 4.1. Spent fairly large chunks of time on it. Was getting fairly near the end, when I was doing a couple of things today. I noticed an image that I thought needed more developing, so I selected it on the filmstrip, went in the Develop module, made some changes and came back to the Book module. All pages gone. All 54 of them. Victoria Brampton on the Lightroom Forums site suggested that you were trying to track Boob to Develop to Book issues. I'll help any way I can

Sharad, the product manager for Lightroom, has just posted an update as blog entry on this book issue. It includes specifics on what can cause it and how to avoid it. Thanks to the help of Marko and few other users the team has tracked down a reproducible case/steps that the team can use to nail down a more permanent fix in a future update to Lightroom 4:

http://blogs.adobe.com/lightroomjourn...

(With fixed link)