Mail not loading content in many messages since Tahoe upgrade

Just updated iMac to Tahoe. Mac Mail not loading content on many of my incoming emails, some of which viewed perfectly fine before the upgrade. All I can see on some of them is just boxes. Managed to solve part of the problem by changing Helvetica to Arial, but a lot of the message is still just boxes. (see image) I've read elsewhere that others are having this same issue. Man, I wish Steve Jobs was still around. Apple didn't have these Windows type issues and Windows type bugs and glitches every time you turn around. Ugh.

iMac 27″, macOS 26.1

Posted on Dec 7, 2025 8:04 PM

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Question marked as Top-ranking reply

Posted on Dec 10, 2025 4:14 AM

Tattoued wrote: Resetting fonts will be my absolute last resort since I have SO many open. I'm a graphic artist so HAVE to have my fonts.

Understood. But most likely one of the user added fonts is causing the problem and the only fix is to remove it. It may very well be an old font which you never currently use anyway, so you might focus on any that fit that description.


A reset will put all user fonts in a separate folder, from which they can be individually installed again as needed.


Restore fonts that came with your Mac using Font Book - Apple Support (SG)



7 replies
Question marked as Top-ranking reply

Dec 10, 2025 4:14 AM in response to Tattoued

Tattoued wrote: Resetting fonts will be my absolute last resort since I have SO many open. I'm a graphic artist so HAVE to have my fonts.

Understood. But most likely one of the user added fonts is causing the problem and the only fix is to remove it. It may very well be an old font which you never currently use anyway, so you might focus on any that fit that description.


A reset will put all user fonts in a separate folder, from which they can be individually installed again as needed.


Restore fonts that came with your Mac using Font Book - Apple Support (SG)



Mail not loading content in many messages since Tahoe upgrade

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