The Ken Burns effect seems to be finicky with WordPress (at last from v3.9). Try a different effect to see if that works out.
As for WordPress 4.0 affecting a site, please note that usually this relates to a plugin that might not be compatible. This has happened to a couple others where they discovered a plugin they were using was not yet compatible. For my themes, I use strictly WordPress based standards without custom scripts, and so far with my own testing (without plugins), the themes are 100% functional with WP 4.0
But to confirm this, what theme are you using and I will test it again locally. Basically you are saying the bottom widget positions and social bar have disappeared and you can’t put “new” widgets in the right sidebar?