Thank you very much, Martin!  I do not know where they all hid themselves, but using the Tiles feature unhid them. Now all is right with the world again . [8-|] [Y]  .

Hello Pegasorum:

I am unable to Open to read any of the messages in the List of folders. This includes New Mail, Deleted messages, Copy-to-Self, and all the others that appear in that list of Trays and folders. When I double-click on a message, or use the "Open" button, it will appear in the list in the toolbar along the bottom, but it does not actually open in its own window. I have not, to my knowledge, changed any options -- it just started to happen.

 Can someone suggest where I could start looking, to try to find out what I have somehow done?

Many thanks,

 Peter

First I suggest you go to the Pegasus Mail menus and select Window/Tile  This will expand any resized/minimised window to a reasonable size. Any hidden window will also appear as a square window.  resize windows to a size you like and re-click Tile to return to a normal collection of windows.

HTH

Martin