I have create a Book in the Book Module. In Book Settings, it is set up as a Blurb Photo Book. There is a "Send Book to Blurb..." bottom right which works. There is a "Export Book to PDF..." bottom left which doesn't work. Usually a window pops up where you can "Save As:" and "Where", but nothing happens. Lightroom Classic V10, Mac OS Catalina 10.15.7
Can you try a test? Take any collection of a dozen images and open the book module - don't worry about layout etc. just test the print to pdf, print to jpg. Is it just this book that won't print?
Let me piggy-back on your problem since I'm seeing similar issues with Lightroom Classic and a 52 page book I'm trying to create. In my case, neither "Send Book to Blurb..." nor "Export Book to PDF..." do anything at all - no dialog is shown, no errors are reported, buttons just appear dead. I tried creating a small book with 6 pages and see the same problem there so it's not likely related to size. I have successfully created books from Lightroom before but this is the first one with this particular update (10.1.1).
Some more info. I opened a book I had previously exported both as PDF and to Blurb successfully and see the same problem there - I can no longer export it. The latest book was successfully exported to PDF when I last did an update back in December. That was on the same iMac but prior to my upgrading to Big Sur and on an earlier LR release.
Next attempt - I gave LR full disk access in System Preferences.../Security and Privacy. Still no luck.
Try using the Creative Cloud app to uninstall LrC 10.1.1, shutdown and restart your system, and reintsall LrC 10.1.1.
Thanks. That feels a bit draconian but it's better than "format your hard disk and reinstall the OS". I'll give it a try and see if anything improves.
No luck - exactly the same problem after uninstall/reboot/reinstall 😞
A LrC uninstall and reinstall retains the old Preferences file, which may have become corrupted, which can happen during updates. Try resetting the LrC Preferences file as outlined at the below article. Renaming the file allows the old file to be restored if of no help. Make sure to close and reopen LrC to load the new Preferences file.
Sorry - still no luck after removing the Preferences file.
Since you are not the original poster here can you confirm what OS you are running?
Apologies - I only just saw this request! I got an email notification for your later one, though.
Also what LrC version you have installed. 10.1.1 is the latest.
From my initial post, 10.1.1.
I just found this post. Are you using Smart Previews with the original files offline (disconnected external drive, or no permissions).
All files are online and accessible to LR, stored in the same Thunderbolt RAID drive that they were last time I managed to create a book.
What version of OS are you running?
macOS Big Sur 11.2.1 (20D74)