If you're looking to edit or upload userpics, the option to do so is no longer in the drop-down menu on the main LJ page. Now you need to go to that page and click on your default icon; at that point the userpic page opens in a new window, with a link to the old edit / upload page at the top.
ETA: it's back - LJ must have been fiddling with settings because the Manage Userpics option is back this morning in the Profile dropdown box where it's always been. False alarm folks!