When editing your Assignments in Canvas, if your changes will not save because the Save or Save & Publish buttons do not respond:
Scroll to the bottom of the editing page and click Manage Assign To and check the due and availability dates. If they are in error, they will need to be cleared or corrected, then click the Apply button.
Changes made on the Edit page should now be able to be saved.
If you have any questions or issues, contact Academic Technology Support
419-434-4357 option 2