Did you not get errors when uploading the pdf? Lulu is showing the following errors when I upload the pdf:
Conversion Error: Transparencies and layers could not be flattened. Please retry uploading or contact support for additional assistance. Review print guidelines.
We've found an error in your PDF and can't automatically repair it. Please revise the file or contact support for more assistance. \nError Message: Invalid content stream parameter.
We've found an error in your PDF and can't automatically repair it. Please revise the file or contact support for more assistance. \nError Message: Error in PDF syntax.
It won't let me continue without addressing. I've tried "repairing" the pdf, I've tried flattening it, I'm not making any headway. Any ideas?