First things first, check your tags for hidden HTML. Go edit your article that has the tags. Toggle the article editor to HTML view. The tags should look the same in both views. If there is any hidden HTML in the tags, then clean it out.
Also, Try changing the image URLs. I'm not sure that this will make a difference. But, it's a good place to start. Try removing the slash in front of image, so that your URLs look like the ones below.
If that doesn't work, then try full URLs.
One other thing, and I am not sure how this is related, I noticed that the page with the slide show is throwing an error.
Uncaught TypeError: Cannot call method 'appendChild' of null mootools-core.js line 294
The error could be a result of the Nice Slide Show extension. Or, it could be a glitch in MooTools. Start with the first two bits and we'll go from there.
~ All the best