In reply to Rick Ankrum.

Not seeing the problem myself, but I suspect that you might be using some kind of privacy software in your browser, which prevents the editor from using the browser's local storage, and thus prevents it from remembering your most used blocks or something similar to that. In which case, the fix is to turn off that software that is causing the issue, whatever it may be. Try using a clean browser, without extra extensions.

In the latest versions of the editor, if you don't want to see the Most Used Blocks section, you can turn it off in the editor's Preferences modal.