When I try to edit margins or padding in a section/column, the numbers can no longer be set by dragging (please bring that back!) Also, you cannot edit the '5 px' contents but instead you have to erase all and type '7 px' instead. Sometimes, the settings panels don't even show the fields, just a big blank black area where you can click to enter the field contents if you know where they are.
Also, I tried to set the custom CSS class name for the section in my module (#299, Homepage Services Menu) and I could not set it. When I clicked in the content area, the cursor went there, but then if I tried to type anything, the popup would close.
See screenshot of blank popup box.