We've been using the wp simple paypal shopping cart plugin for a year now or so and has been working great. Just since the upgrade to 3.5 the shortcode, which can be used in combination with the NextGEN Gallery plugin, breaks the layout. You can see this in action on:
Like i said before. This suddenly stopped working. I guess this shouldn't be a too great a hassle to fix it, right? Dug around myself a little bit, but for me it's not so easy.
Anyway, the add to cart functionality doesn't work in this desired way.
Please get back to me.