My first instict would be something to do with image blockers.
Do you get a pop-up/hover info when you hover over the question mark? Sometimes there is additional information as to why an image isn't loading? The images on GDrive have been made available public, or do you have some sharing restrictions on them?
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Images not loading - across clients and account signatures
The image settings are open and public. And all three accounts are working, but with intermittent “outages” where the bio pic and logo do not load. These have lasted up to one hour. Spoke to a friend of mine and he confirmed his images were not loading as well. Wondering about a broader hubspot problem.