Recent changes to Google's Chrome browser have affected Vocareum lab functionality. If you are experiencing issues with the Submit button not working in your lab. Or you are an instructor unable to to change the cell types in a Jupyter Notebook. Please follow these steps:

From within the Chrome browser place chrome://flags/#origin-agent-cluster-default into your search bar.

This will take you to the Experiments section of the Chrome settings.

Navigate to the setting "Origin-keyed Agent Clusters by default" highlighted in yellow.

From the dropdown menu on the right, switch from Default to Disabled.

Select Relaunch from the prompt that appears at the bottom of your browser window and your Vocareum assignments should be working as expected.