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Hey all,
I'm in the same boat, and checked out Waterdog's reply above. I was surprised to see that those images do indeed work. I tried to figure out the cause- was it format? Size? What do they have in common that all other files do not?
I'm sorry to say that I've figured it out, and it's not good news.
It turns out that when you copy and paste an image from a webpage, SharePoint is NOT pasting the actual image in there. Rather, you're getting a reference URL. If the images you want to paste inline are from the web, you'll be fine. But this does me no good, as I need to be able to take screenshots and paste those in. Doing that, you just get the problem the rest of us report: the image appears and will remain until the form is submitted, after which it vanishes.
I do intend to pursue this further. If I make any progress, I will update this post.