Being excited to see my writing in real electronic book form, I started playing with the compile options after having only written one chapter. By the way, I don't recommend that as a viable strategy for actually getting any writing done. Normally I'm fairly good with delayed gratification. But cut me some slack. This is my first book.
Anyway, as I was writing, revising, compiling, viewing in Kindle for iPad, I noticed that at some point the tab that starts each paragraph disappeared. I tried, I really tried to tell myself that it didn't matter right now. I'm not ready to publish anyway. But the technologist in me just would not let it go. So for about four hours I googled, read posts, tried various compile overrides and nothing worked. Then finally I struck gold!
I'm not sure where the inspiration came from, but I recalled that when I first started writing, whenever I would hit Enter to start a new paragraph, the new paragraph would automatically indent. But at some point I did something that eliminated that feature from the existing pages I was working on. If anyone reading this post has an idea about what I did to eliminate that feature on the page, please comment so that others will not experience the same frustration I did. I created a new page from the template and the automatic paragraph indentation was working there. So I performed a test. I wrote some random text into the new page, making a few paragraphs along the way and then compiled the book leaving all the compile options as I had previously set them. And voilà my new scene had proper paragraph indents.
So having discovered the problem, I created a new template page for each page I'd already written and then copied the content from the original page for placement into the new page. When I pasted the content into the new page I chose Paste and Match Style and then reformatted the text as necessary to get it to the desired state. Fortunately I only had about a dozen or so pages to fix. Once I completed creating the new pages, I performed another compile and my book was beautiful once again.
I know from my google research that there are many different ways in which this problem of losing paragraph indents presents itself. This was my particular issue and I'm glad it is solved and I can now get back to writing my book.