While I was trying to upload some new photos onto my blog, I realized that all my photo sizes are gone. I use different sizes in blog posts and final tiles gallery as my portfolio so they are pretty important for me.
Uninstalling Simple Image Sizes and WP Smush did not help. Updating WordPress and all plugins to the latest did not help as well. So it had to be my Upgrading Ubuntu 14.04 to 16.04 for WordPress that messed it up. Continue reading