Invalid image URL - tried all solutions!
Last week I started being blocked by an "Invalid Image URL" error on my emails, even previous emails which worked fine in the past.
I read the past articles and I've tried clearing my cache. I also checked for the ghostery extension, but I don't have it. I use underscores instead of spaces in file names. I upload images into the Design Studio on Marketo.
My boss is not having the same issue as I am and can edit the URL and Alt text on the images fine.
Any more ideas of what might be causing it?

Thanks,
Eleanor