Thank you, I've just tried this. The pictures that it displays are about 30-40 kb so I decreased the size of some other pictures but they were still attached as icons.
By the way, all pictures are jpg's but the ones that OmniFocus is willing to display are from the same source. I don't know if it's important or in what way they might be different from the others.
Originally Posted by Toadling
Are the ones that appear as icons larger (in pixel dimensions or file size) than the picture that displays inline?
I'm not certain of this, but my theory is that OmniFocus only displays pictures inline if they're smaller than a certain size. But where exactly that cut-off point is, I don't know.