I have always been happy working with Spage Builder. In some cases, I can no longer control the spacing functions in the frontend after inserting images. It has been buggy and or all around not working with saving issues, and finding things, and total functionality breakdowns. The optics were also better in 3.0. The editing blocks also open in places where I have to keep scrolling the screen. It's incredibly hard on my work.
You can also no longer go back to Spagebuilder 3.0 if you have saved the page again in 4.0. That does not work.
Please go back to the original format much easier to use and much more functional overall.