page request could not be verified and appears to have expired

I can receive emails just fine, but I cannot reply or compose a new one, 
and I'm trying to within 10 seconds after logging in.

These are screenshots of the errors I receive when replying to an email, 
or composing a new message.
https://i.postimg.cc/QxX0fQrf/Screen-Shot-1701781435.jpg - reply
https://i.postimg.cc/PJKbg7k2/Screen-Shot-1701781635.jpg - compose

This is a screenshot from web host error logs.
https://i.postimg.cc/ZR2bH8nn/Clipboard01.jpg

I don't have access to any mail server logs.

Squirrelmail - 1.4.22, this is the version that I have installed 
manually on my shared web host. At this time I only have the 
Administrator and Compatibility add-ons installed.

SquirrelMail - 1.4.19, this is the version that my web host has 
installed themselves, and also works correctly. I can't stand it though, 
as I have no control over just about anything, such as themes and CSS, 
and I can't add any add-ons, I can't even disable or remove any of the 
few they have installed.

This is information that I got from my web hosts' "control panel".
Platform Type 	Debian
PHP Version 	7.3.2

I got this from a Received: header.
Cyrus - 3.9.0

RainLoop/1.17.0, I installed this webmail package and it works fully.
BetterBird - 115.5.1-bb19, this is the email client that I use, and it 
works fine too.

These are the browsers I have used. Pale Moon is my primary browser. I 
refuse to use Edge, Chrome, or FireFox. If the problem is because any of 
those browsers aren't used, oh well, I'll just have to settle with 
RainLoop, or my email client.

Pale Moon - 32.5.1
Floorp - 11.6.1
Mercury - 115.2.0esr
Vivaldi - 6.2.3105.47

I used to have a working copy of Squirrelmail that I installed myself in 
2006. I used and successfully upgraded it when necessary for 5 years or 
so. Unfortunately for me now, I have deleted all the related 
directories. I also loaded the configtest.php page, and it did not 
report any errors. I have the variable $max_token_age_days set to 5 and 
it is in the config_local.php file. The mail server settings that I used 
are the same as the ones in the working copy of RainLoop and the email 
client. Browsing thru this page was unhelpful to me: SquirrelMail / 
Mailing Lists / Search - 
https://sourceforge.net/p/squirrelmail/mailman/search/?q=%22appears+to+have+expired%22&limit=100

Thanks for any assistance!





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