reaction times not recording

I am currently using superlab4.0 to run my thesis experiment and I am having a lot of trouble getting the program to record reaction times.
My experiment consists of

  1. a blank screen with fixation cross
  2. a still picture
  3. blank screen
  4. video
  5. blank screen

The reaction time is supposed to be recorded as soon as the participant selects Y (for yes) of N (for no) during the video, however, no response or reaction time is recorded in the excel file.

Any help you could offer would be wonderful!

Thank you for contacting me by phone regarding your experiment.