One thing that has been very annoying lately is that if you have Google+ there is a totally different interface than if you do not. There is a solution for this!!!
Right after you start picasaweb.google.com, if you have Google+ a brief yellow option comes up - "Click here to go back to Picasa Web Albums". Click on the word here and you'll go to the old interface. Yay!!!
Thanks to this page for the complete instructions: