Somehow I've ended up not being able to move objects with my mouse the way I expect. In some cases they will move, but only by grid lines. I also can't rotate. I can still move them by typing a value into the move dialog, but rotating doesn't work at all.
Here is the blend file https://drive.google.com/file/d/17CQTB_8dIWrEcy0Uf-8vGA3XPBsJI6WE/view?usp=sharing
Ay ideas about how to get back to freeform movement?