The drag and drop features are not working correctly in the TOC. This is happening in 12.4 & 12.5. Create a larger project. Try dragging and dropping TOC items from the bottom of the TOC list to the top. The scroll does not work properly. If you scroll using the mouse wheel, the item you are trying to drop is lost from the drag operation. It seems you can only drop an item a few entries or else it drops in a random place or back in it's original position within the list.