A regression from 1.6. In version 1.6.5.123 the pen tool works as described by @squirrelfire 1.6.5: Create a closed shape with the pen tool. When you hover the nodes a minus symbol is displayed next to the pen tool. If you click and drag the node with the left button you can round and shape the tool. 1.7.0: Create a closed shape with the pen tool. When you hover the node that closed the shape a minus symbol is displayed next to the pen tool. If you click and drag the node with the left button you can round and shape the tool. Hovering ANY other node displays an... anchor symbol... and clicking and dragging add new curve to the selected curves object. The "Add new curves to existing curves" is always on when using the pen tool no matter if the toolbar button is selected or not. .... but if you click on one of the cursed nodes with the node tool - just once - you can again manipulate it with the pen tool. Originally reported by @squirrelfire