If I click to Edit any watch face from my profile page (https://www.facer.io/user/uQxMyVurkO), I'm led to https://www.facer.io/404, instead of the watch face open in Facer Creator.
Bug confirmed - will be fixed shortly. Thanks for your report!
The same 404 error occurs when clicking Edit on any watch face on another watch face's page. For example, if I go to First Snow (https://www.facer.io/watchface/Xga6Yva8kR) and click to edit one of the four watch faces below...
RESOLVED. Navigating to Edit works from everywhere now!