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Greetings Andy:
This is just a guess, but it sounds like you have messages set to be sorted in some method other than Date/Time. From the main topics listing you'll see a few columns that list Discussion Topics, Author, etc.. If you click one the title of the column the messages will sort according to that field. For example, to list messages by Date/Time, you'd click the Date/Time column header.
If this doesn't fix your problem, please let us know.
Ben

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Greetings Andy:
Glad you got it all sorted out.
>>PS I see another "recruit" from Aus has found you.. Great.!<<
Yes, I saw that. We have a number of guys here from the UK, and my hope is we can do the same with pilots from your end of the world. One of the visions we had when we started this grand experiment of ours is we'd be able to have flyers from all around the globe here at the VPC so there'd be flights 24/7, and region-specific scheduled events such as chats to account for the different time zones, etc.. <fingers crossed> 
Ben