I figured out the shop wizard issue that was bugging me.
If you go to the shop wizard through the neopets interface directly, like a normal person would, when you return to it by hitting back in your browser, it may not work and you get an error (this has improved in recent days, though). If you hit back and do not get an error, your search field will be empty and you have to retype what you're looking for. This also happens for reloading the shopwizard with F5.
If you went to the shop wizard from somewhere that preloads your search, like the jellyneo items page does, then you don't get errors for going back in your browser.
In boring technical terms, the URL for the shop wizard normally looks like this: http://www.neopets.com/shops/wizard.phtml
But a preloaded search looks like this: http://www.neopets.com/shops/wizard.phtml?string=Pirate+Hook+Candy+Cane
Adding that string argument fixes something that normally goes wrong with the reload or back. I don't see a lot of people bookmarking pre-loaded search terms so this doesn't have a lot of practical value for you guys, but it bothered me, so I had to figure it out.