I was told to post known bugs from development versions of WordPress in this forum from the official blog. Therefore, post it I have.
I was recently testing my website with WordPress 3.6. I soon realized that if one posted a page or a post with brief content, and the sidebar widget had a great amount thereof—the sidebar would extend beyond the main widget area and the footer.
I hope this will be looked into prior to the release of the final version, I hope I am not too late in posting this bug—and I humbly ask for your support in this.