With the latest update to Ventura 13.5.2, Mac mail messages appear as black

If all else fails try the following in order as needed:

1 - launch Mail with the Shift key held down and see if there's any improvement with Mail.

2 - boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

jph108 wrote:

I recently installed an update to Ventura 13.5.2. After this, in Mac Mail, new email messages are randomly displayed as a full black window, no message visible. Quitting and restarting Mac Mail, and also rebooting, did not help

The current stable release of Ventura including bug fixes, security updates is macOS Ventura 13.6

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support