[MikeWV]

You picked it, Jellby. I changed the media type to text/css and all the css errors went away. I figured it was probably something simple that someone with more experience would catch.

The file was indeed named stylesheet.css. I just had to change the extension so that it could be uploaded, as css is not one of the file types allowed for uploading.

Unfortunately I found one other inexplicable error that I hadn't noticed buried in all the css errors. I'll start a new thread for that one.

Thanks to all.

Scratch that other problem! That, too, was something simple. I had a space in toc.ncx where should have been none.

I downloaded and installed Sigil but didn't use it other than to see if it could open and display my book. I may try using that for my next book.