Okay, I got the Epub Tools (specifically) working again, but didn't manage to repeat the errors I found. So, I guess chalk it up to operator-error?
However, I did manage to get a docx copy of the same book into Calibre, converted and tweaked, to load into Marvin on my iPod. So the Tools experiment failed, but the docx one succeeded.
Now to see if I can manage to repeat the success.
Oh, Hitch, thanks for the bit about online Word tutorials. I spent about 4hrs yesterday, looking for and through several. I didn't learn anything new, but did confirm that what I knew, I know is correct. Also, the hints about Outline View and Document Map (both new to me) were nowhere to be found in any tutorial I found, although they allowed me to locate 4 different style errors, in about 1 min.
I also took the precaution of making a Notepad copy of my CSS file, since I'll be using the same formats most of the time. Now I can tweak it if needed, quick and easy.
Quick yes/no advice question? I want to have a first-line indent for my non-heading paragraphs. Would you suggest making a separate style for those, or just highlighting and adding a tab after I paste them into my docx template?
Seems I've learned enough to get along with for now. (crossed fingers)
And thanks for the add-in, Tox. Just didn't work for me. /shrug