400 error when switching to dev mode

Hey there, thank you for reaching out!

Usually a 400 error indicates that either the file is deleted or that you no longer have permissions on the file.

Can you please let me know if you have a full Design seat or a Dev Mode seat?

If you do have a full seat or a dev mode seat can you please check the following:

• Confirm you have WebGL installed and enabled
• Clear the cache
• Make sure you have the latest browser version

Thanks!