Marketo will be performing maintenance on Saturday April 14th that will affect the display of images in Email and Landing Page Editors. There will be no affect to live emails or landing pages. When editing emails or landing pages, images may not display within the editor for a short time between 9:00 AM and 12:00 PM Pacific Time. All images will function normally in live emails and landing pages.
If you have any questions, please reach out to Marketo Support at https://support.marketo.com