Weird....your post showed simply a blank post until just now and that's when I saw the yellow paintbrush. I somehow missed the pic of Bart Simpson...oops!
That's one of the issues with links from other sites. I still haven't seen the yellow paint brush. The best way to avoid the missing images prob is to avoid the quick reply button. Click the "Go Advanced" button to see if the image shows up in the post preview before posting a reply. That usually works.