@xorpheous, if you referring to single posts using up half of the available content space (leaving empty room for a second column, like here) this is an issue we’re fixing in the upcoming update.
Otherwise, the homepage posts list and other posts lists (categories, archives) always used the same layout simultaneously – either posts in two columns or posts in one column – excluding the sidebar.
@pattyoss, it appears you’ve disabled (or never used) the magazine layout option. You’ll be able to re-enable it after the next update without it breaking the single posts layout anymore.