Changes to book module won't save
I have spent several months creating a book, which has worked perfectly until yesterday. I'm using Lightroom Classic version 11.0.1 and Windows 10. Suddenly the last 25 pages disappeared (which I can easily add back. That is not the problem I want to report. My collection of edited photos is still intact and I had saved a pdf version for reference before the problem began).
My greater problem is that since the pages disappeared, I cannot remove or rearrange pages and have the changes save. Likewise, I cannot change any of the cells on a page and have the change save. When I attempt to remove pages, I get the following error message: "Unexpected error performing command: invalid page number position".
I've shut down and restarted my computer multiple times. I have uninstalled and reinstalled the newest version of Lightroom Classic. I then installed version 11. None of these attempts solved the problem.