This was initially a two part question but I figured out half of it just now. My fields in a form were not suggesting entries even though they existed in the entry list. I tried it on my mac and it works perfectly with the same form. It has Reader X on it so I guess perhaps it was a bug in the version I had on my PC. ANYHOW...
Auto complete works fine but once the document is closed the entry list is emptied. (On my PC and my Mac) Is there a setting I don't see that I need to change, because that makes auto complete rather useless otherwise!