Hi everyone,
Let me first thank everyone who has stopped by to help me and give me suggestions. I appreciate each and every one of your tips, ideas and bits of information.
I have tried opening my skin in SKS5, hiding the shadows there, and then re-opening it in SKS6. Unfortunately, this did not work for me. I made the appropriate change in SKS5 (I set HideShadows=1), saved and applied the WB. Much to my agony, the black border still persists.
I have checked the pixels around my borders and there are no stray pixels outside of the frame and drop shadow.
Also, I tried to manually add "HideShadows=1" to the Top Part of the Start Panel section, but that did not work either.
I guess I will continue to work on the other parts of my WB and hopefully a resolution to my problem will arise.
Cavan1: Thanks for the quote tip as well.

Thank you again to everyone. Your help is much appreciated!