1. make sure the plane is active. If active, it will be underlined in the structure browser and will be green in the modeling window.
2. Start the command
3. Click on the starting point
4. Move the mouse to the final point (do not hold any buttons down.) and click the final point.
5. The rectangle is created.
1. Yes the plane is underlined in the structure manager and is a bluish/green border (same color as your picture).
2. After left clicking once at my desired starting point, the crosshairs stays at the the location I clicked, and the curser (controlled by the mouse) turns in to a normal white-collored arrow. Once this happens, left clicking anywhere on the plane does nothing. No rectangle shape is ever seen.
After I left click at my desired starting point, the message in the lower left corner is still instructing me to specify the first corner point of the rectangle.
Right click at the bottom bar of the modeling window and turn on the "catch menu" Set your catches as shown below. The range can set as desired, I find the 10 works well when the units are set to mm.
