So when I move a group of brushes or entities it doesn't snap to the grid automatically as it did usual, and I think it has something to do with this yellow cross in a weird spot. The yellow cross (origin marker?) is in the same place for every group when I move them. How do I fix it back to normal?
The yellow cross is the middle of the grid when the group was made, so you can either: Un-group & re-group after positioning the group to get the snap point where you want OR Change from "Groups" select mode to "Objects" when moving the group
