BW> I just noticed that the MC (check e-mail) function appears to "miss"
 BW> unread e-mails in its listing -- it only displays (lists) e-mails that
 BW> are unread *and* new -- however the counter (prompt 127 &2) correctly
 BW> displays the number of unread e-mails.

The e-mail base is not a message base, so throw out the idea of "new messages" and "last read pointers" in this case. MC lists all of the e-mails in your mailbox, and optionally hides the ones which you've read before if you use the /unread option.

 BW> I exit with G (as my Private Messages is mandatory reading and it will
 BW> prevent me from exiting with Esc, apparently as long as there are new
 BW> (N) messages left).

This is a bug and will be fixed in the next build.  You shouldn't be able to use G to exit in that case.  If a base is mandatory read you should never be able to exit unless you've seen the last message.  Nice catch!

 BW> Here it misses displaying #34, even though I haven't read it. (It is not
 BW> new, but still unread.) Notice that the prompt correctly says 2 unread

 BW> Notice no listing of the only unread message (#34), despite a correct
 BW> counter (1 unread). The completely empty list confuses the user (= me).
 BW> :-D

The prompt you are showing is not the default so I don't know what prompt code you are using (that prompt has two prompt codes that give different values).  It does look like a bug in that its either not displaying the first message when it should or its displaying the "list" prompts when it should be showing nothing at all. However I cannot seem to produce any problem here...

If you can give steps on how to reproduce a problem with MC without all of the stuff with the reader/lastread/new messages/etc I think that would be less confusing and more helpful for me.  In the meantime I will try to do some more tests based on your original message to see if I can find a way to reproduce a problem!

I am putting up a new build now with the 'G' mandatory fix in there so it might be helpful to make sure we're both using that version when we try to narrow this issue down.  Thanks for the feedback!

... Running Windows is better than washing them!

--- Mystic BBS v1.12 A47 2021/07/28 (Windows/64)