I just found it, the link is at the top of the thread, or rather it is in my view as the original poster.

Thanks again

I have a new and nasty problem Would be grateful for any help curing it.

When I visit a folder I often notice that the most recent message has vanished. If I click on another folder and then come back to the first then another message has vanished.  This can be repeated and each time the folder is revisited another message has vanished. The count of the total messages in the folder does not change.

 If I re-index the folder they all re-appear.  If I check the consistency, it reports no problems with the folder.

 This is particularly happening (or I have only spotted it) on two folders Copyself, 9000 messages 2.7 Mb which is in the root of the structure and a folder I have added which is two filing trays down the structure 1000 messages 9Mb

Using Vista x64 and Pegasus mail 4.51

 Thanks in anticipation

[quote user="philip_percival"]

When I visit a folder I often notice that the most recent message has vanished. If I click on another folder and then come back to the first then another message has vanished.  This can be repeated and each time the folder is revisited another message has vanished. The count of the total messages in the folder does not change.

If I re-index the folder they all re-appear.  If I check the consistency, it reports no problems with the folder.[/quote]

Just some quick thoughts:

1. Did you open that "most recent message" for reading or marked it "read"? In preview-mode this will be done by default when choosing the message in the list.
2. If 1. is true: Did you look at the end of the list (or somewhat between, where the read messages begin) for that message? Is it there?
3. If 2. is true: I bet you have turned on sorting "unread before read".
   

[quote user="HDT"]

1. If 2. is true: I bet you have turned on sorting "unread before read".
   

[/quote]

 Thank you very much, I have to confess, I have not even thought of that despite having used pmail since the dos version.  I have learnt a lot more about how the hierrach.pm file works though from reading lots of other postings here, and had spotted the strange order of messages which I fondly imagined were in date order.

[quote user="philip_percival"]Thank you very much, [...][/quote]

My pleasure!

If that problem is solved, pls mark this thread as solved (not sure how this works, but read about it).

[quote user="philip_percival"][quote user="HDT"]

1. If 2. is true: I bet you have turned on sorting "unread before read".
   

[/quote]

 Thank you very much, I have to confess, I have not even thought of that despite having used pmail since the dos version.  I have learnt a lot more about how the hierrach.pm file works though from reading lots of other postings here, and had spotted the strange order of messages which I fondly imagined were in date order.

[/quote]

 You are not allone ...
This is something which also just happened to me and another computer I was looking after ... and it really puzzled me how I/that person could have accidentally switched it on (read before unread). Well, the explanation was something which I never thought of.

When you click on the most left column header in the email list view then the column (emails) is (are) NOT sorted as to having attachments or not, what one may assume, but weather they were read or not! The attachment symbols as well as the ticks for 'read' are both in the same column!  ... it is fairly easy to accidentally click on that column header. Maybe something to be changed in the next version ;-)

Cheers

Thomas