Hi @Cris Kolkman ，
From the first screenshot you shared above, it seems the issue is similar to what is described in the official document below:
Missing images in ECP
Please go to Control Panel > Programs > View installed updates, check if the April 2021 Security Updates(KB5001779) for Exchange 2016 CU20 has been installed. If this is the case, as suggested in the link above, please uninstall the update(KB5001779), download the .msp file from this link, run command prompt as administrator and run MSP from there, then reboot the server and check if the issue persists.
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