Running NeoLoad 5.4.2 on Mac OSX 10.11.6 on 8 core Mac Pro. We run Neoload against our Javascript web app that is playing video. When click stop recording, we have the popup Waiting for server responses. It never closes. We tried quitting the browser under test, it did nothing.
Have you tried to click on the cancel button?
Normally it should stop the process. Which browser did you use? Is it Safari?