@gcluley - we added the support smaller resolutions (responsive designs), so the bar doesn't float. However you can add a simple @media query right now to display: none the entire thing for smaller resolutions if you like.
We do have plans on making it better in the future releases by adding a toggle share menu for smaller resolutions to better support responsive design.
@ocmega - I have not been able to replicate your error. I have tried it on Windows (Firefox, Chrome, IE) and Mac (Chrome and Safari). With our default install running the Twenty Twelve theme and no other plugins, this seems to work fine.