Problem reproduced in both OmniWeb 5.5 and by building the webkit ToT and the mini-browser example code and executing mini-browser with the ToT webkit by running "run-webkit-app ~/Products/Debug/MiniBrowser.app" The issue is that if you rate the product lower than the rating it's currently at (for example it defaults to 3 stars, so click the 2nd star) and the javascript widget disappears. There's still spacing for it, but no star javascript.
The linked URL no longer repros the problem, alternatively, you can use these steps: (the issue only happens on pages that have multiple ratings) 1. log in @ amazon.com 2. click the recommendations link @ the very top of the page. 3. try to rate something. (note, the stars should be blue! if they're orange, it's just a hyperlink) expected result: stars update. actual result: page reloads to a blank white page. hitting back will bring you back to the page, and your ratings change will appear. Also seen @ netflix.com and goodreads.net