I’m having this problem now too. Started April 7th, images were fine, but with the state of things I wasn’t able to troubleshoot right away. I can see the image in Email Customizer in Woo, if I send a test email from within Email customizer I can see the image but it the email is just sent normal as part of an order, it’s shows the broken image icon. I use Gmail, but my coworkers are using other email clients. I’ve confirmed that the images are there.