Coding Mercury & Venus - Can't get passed blue ice

I'm using the coding fundamentals curriculum with my students.  I have been doing the lessons first to make sure they work.  I did block 2 lesson 2 a few weeks ago and got through it fine.  Yesterday, I can't get the agent to trigger the activity complete on the blue ice.  Can someone please help???  Is there a way to get back to the space lab?  Thank you.