I'm using Genesis 2.0 beta with a custom theme. On my blog page while the bar is at the top (before scrolling the page) a center-aligned image inserted in the post is pushed off the post area, covering the sidebar.
Once I scroll and the bar starts to float, the image pops back into the post location.
A sample blog post is here, but I have the floating social bar turned off now (and Jetpack back on).
And image is here: