Regarding your site layout issue, this help page explains the likely reason and provides a workaround:
As for our site loading slowly for you, we've not seen any performance issues here, and it's been loading fine for me all day up to now, so it sounds like a network routing/connectivity issue between your ISP and our Tucson datacenter, which could cause incomplete loading of our Admin components leading to the problem you encountered with View/Edit Products. Once that connectivity issue clears up, so our site is loading normally for you again, we'd suggest force-reloading Seller Admin by holding the Ctrl key (on PC) or Shift key (on Mac) while you click Refresh/Reload (or Ctrl-F5 does the same thing on PCs).
Possibly both of you happened to hit congestion on the same backbone route. We're also working on a total migration of our services into the Amazon server cloud to be finalized later this week, so it's possible something related to that testing and preparation briefly impeded our system response this afternoon. At any rate, this migration to the Amazon cloud should eliminate any network performance factors related to our legacy hardware and the Tucson datacenter where it's colocated: