Interpolate curve not working

My interpolate curve tool is no longer creating a curve when I click multiple points… I may have changed a setting by mistake

Hi - please run the Rhino SystemInfo command and copy-paste the result here.
How are you starting the command? Can you place a few points, end the command, open the command history (F2) and copy-paste the command-line feedback from where you start the command to where you end it?