Hi Linda,
Thanks for reaching out to us. Please try reloading the experiment. If you're still experiencing this issue, send us the link to the stuck experiment. And also
the maximum execution time for the free tier per experiment is one hour. If your experiment need more than a hour of execution time that'll get queued. In the paid version you'll get 7 days (168 hours) for a single experiment execution.
At the meantime, I would highly recommend you to try with new Machine Learning Studio: https://ml.azure.com/
Document here: https://docs.microsoft.com/en-us/azure/machine-learning/service/tutorial-designer-automobile-price-train-score
Regards,
Yutong