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okemos_donna wrote:

... I went through and deleted those that I thought could potentially cause the problem (including CleanMyMac). This seems to have fixed the problem. If it changes, I will come back and let you know.

Good job. NEVER install this cmm thing, if you want a sane and safe mac.

Identical Software ( Third Party Software ) on both machines or are there some differences ?

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster and comprising the Operating System

Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale. What the Application may do to the computer is up to the User to check this out before purchase

Any of the below should be removed as per Developers Instructions 

Below list is only a partial list and as new " Bad Actor " Software appears on these Forums, I update this list to remain current

This will include CleanMyMac , This will include BitDefender , 

This will included Norton Antivirus , Sophos Av Software

Intego AntiVirus, McAfee, MacKeeper, Avast AntiVirus

Ad Guard, Webroot , ESET , Avira 

AVG AntiVirus  

Trustee  

The The Built in Security  is all that is required.

Are the two computes Both running the same version of macOS Monterey ?

Thing have changed in Monterey regarding Privacy and effects the native Apple Mail Application regarding Embedded Images or Image Attachments.

A good start is to refer to image below and UnCheck some of all of the Options

Apple Mail >> Preferences >> Privacy is where you will find this

Ditto for @ Luis S comments.

Even after removing CMM - something a Reinstallation via Recovery Mode is needed to put back elements of the OS that this Application has inflicted on the computer.