We haven't had any other recent reports of this and usually if it is specific across all users on a specific browser we get a LOT of notes and reports.
Have you tried leaving BYC and clearing out your browser cache?
Have you tried Firefox or Chrome?
My back button not working like it used to is probably one of the most frustrating things to me with the new platform. I haven't said anything because I figured it came along with the new platform and the way BYC now communicates with my computer.