Hi Lynne,
Try and edit the post which contains the table, once you edit it the border goes missing.
There is not problem with creating post with table, but when you edit it.
It is fine with version before 4.1.4, so I guess it may be due to the CKEditor.
I did try to edit it after I had created it. I just went and did so again. It's still just fine for me - the border is still there.