whats with all these 'page not found' when clicking on a screen shot lately?
Those are deleted screenshots, most likely deleted after submission, our queue is retaining these deleted submissions and when they are approved the error you speak of happens.
To give you a very open explanation as to why these oddities occur; until recently we only saw reported forum posts on-site, reported comments and screenshots were sent directly to us via email. Scragg added a screenshot report queue which the bugs aren't completely worked out with yet. This will also explain why any very old screenshots in violation of today's rules may have suddenly disappeared. We did a clean up.