All the links from the base package description pages bring up popups now: System requirements, Contents of base packages, New Contents, Endorsements, etc. It ends up leaving you with a clutter of open popup windows all over your screen. Here's a particularly annoying path: Go to any base package description page. Click "New Contents." A popup window comes up that has an Upgrade button on it. Click on that upgrade button. Another popup comes up on top of that! Egad! Poor design.