YES! GUYS IF YOU WANT OLD POST SIZES BACK: INSTALL THIS STYLE, IT WORKS!: https://userstyles.org/styles/106772/fix-new-tumblr-photo-widths

Signal boost this but also it’s so!! important!! to NOT just install this style and then forget about it and carry on blogging like nothing has happened. Keep emailing Tumblr staff and do not make gifs/graphics until it’s fixed because anyone who doesn’t have this style installed will still be seeing your work as gross, blurry and stretched.