Hey Clyde,
I made the changes as indicated, uploaded the edited files, and...nothing. I deleted them all & tried again, but the sidebox still doesn't show up.

logo_sidebox_one does appear in the admin & it is turned on.

My files are uploaded as shown:

includes/languages/english/extra_definitions/classic/logo_sidebox_one_defines.php

includes/modules/sideboxes/classic/logo_sidebox_one.php

includes/templates/classic/sideboxes/tpl_logo_sidebox_one.php

What have I done wrong? (and WHY do I have so much trouble with these darn sideboxes?!?!). I am tearing my hair out over this!!