My book was about 40 pages and everything worked fine. Now i added about 17 more pages and I am not able to export it anymore. (Neither to PDF, jpg or blurp!) Removing pages, reshuffling pages, whatever i do, doesn't work anymore.
Deleting page by page from the end finally gives me the message "rendering ...." Happily i put all my pages back and removed only this 'last removed page' and to my suprise it doesn't exports again.
bottomline; I have no idea how to solve it and I',m stuck with my project.
ADOBE, PLEASE GIVE US A BUGFIX! (there are many many complains about this topic in forums etc.)
I have the same problem. My wife has worked for over a week on a 240 page book, and we cannot get it to export to Blurb. I'm able to render all the pages, but when it comes to uploading as indicated on the bar progress graph in the upper left corner, it goes part of the way across and then a window pops up saying there is a problem. I worked all this weekend on deleting pages until it finally uploads. I got down to page 106 of 240 and it finally uploaded. So I figured page 107 was the problem. I deleted the photos on this page and then reinserted them. That seemed to work but then it must be getting stuck on another page as it will now uploads up to page 115. So I thought 116 must be the problem. I tried the same procedure that I did for page 107, but no luck this time.
PLEASE ADOBE! HELP US OUT!
I had this problem as well - the upload to Blurb would not work. Creation of a PDF and export as JPEG in the book module worked. I use Lighroom 4 though.
For me, the solution was to turn off the Windows Firewall while uploading. Now it works!
Two-in-Love (Photographe de Mariage en Suisse Romande)