That is a known bug. Actually I haven’t even come around to fixing such issues yet.
Another thing you should probably (not!) try: Click Play on a paper and click on Next/Prev :) The only way you can recover from that is by refreshing the page. Sorry about these rough edges as of now.
Another thing you should probably (not!) try: Click Play on a paper and click on Next/Prev :) The only way you can recover from that is by refreshing the page. Sorry about these rough edges as of now.