The mystery of the IO message solved

The files for my revised nook covers would not load via the Lightning Source site becasue they were too big. They feature more layers than before so this must have increased the file size.

The solution was simple enough. All I had to was send a CD to my customer rep and she's forwarded them to the states. I can now log into my customer account area on the Lightning Source website and track their progress. In a few days I should be able to confirm that the files have been accepted and will order proof copies of both titles.