Several Interactive Lessons have had issues. Several would not allow you to move forward when performing a function. One would not allow you to perform the function. I had one today where I got all the questions correct and it marked it as RETRY. Retried it twice. Scored perfect twice. Still marked as RETRY. This one specifically was Time Series Forecasting\Preparing Time Series Data.
I am at 89% of the interactive lessons completed and would really like to move forward.
NOTE: The RETRY in Predictive Modeling\Creating a Predictive Model is accurate. I need to retake this course.