iPhoto book won't upload
Using iPhoto11 9.2.3.
Have spent literally hundreds of hours producing softcover books for both of my parents who are about to turn 80. I've tried 8 times to upload one of them and, after waiting for at least half an hour, the blue progress bar finally ends and the error message "an error occurred..," appears.
Other threads suggested starting in Safe Mode and doing this again; it received the same message.
What else can I do?
I've used this function before; only 2 months ago I successfully submitted a similar book for my father-in-law's 90th; it took 2 attempts to upload but worked a charm and the finished result was true to the screen.
If it's a matter of photo sizes, what is an efficient way to reduce the size of the photo files?
thanks
MacBook Pro (13-inch Early 2011), Mac OS X (10.7.5)