When I select the content of the first cell of a table and copy it to the clipboard, the whole table is copied.
Do you remember the "table deletion feature" I wrote about for some time ago? In V5.0 RELEASE 4.5 the whole table was deleted when you tried to delete the content of the first cell. This must be related and it looks like you fixed the wrong place.
By the way: try to delete the content of a cell, when it has more than one paragraph in it. Only the first char is deleted.