Hello,
http://sagecell.sagedev.org/ is running a fresh version with Sage-6.6 which has completely different display system.
Please test with your favourite code/interact and report anything that seems to be broken.
JSmol 3D plotting does not work at the moment, but hopefully will work again at least in Firefox in a few days and perhaps in other browsers as well.
Also it now uses MathJax shipped with Sage, meaning upgrade from 2.2 to 2.5 which is faster and has a very quick preview.
Thank you,
Andrey