|The problem I described does not exist if the "send options" menu does NOT have the "save copy of sent message in 'sent items' folder" checked.|
Based on that, I decided to delete a lot of items from the 'sent items folder' - and many of them had photo attachments. After a couple of hours of deletion of 'sent items' over the weekend, all appears to be working normally; that is, my problem no longer exisis.
Who knew that the "sent items folder" could get filled (I often delete from the 'in box' - hadn't thought of the 'sent' box).
Thanks for the help and suggestions.
DW in Maryland