Note: The new platform/site went live on Thursday, June 14, 2018.
From Project Muse:
This launch is a redesign and re-engineering of MUSE’s proprietary platform; the URL structure for all book and journal content in MUSE will remain the same and there will be no need for redirects or updates to DOI links, no impact on institutional usage statistics, nor any need to update proxy configurations.
Direct to Complete Announcement