Hey DoctorDR!
Here is solution for you — open file plugins/regenerate-thumbnails/regenerate-thumbnails.php
Then search for text $fullsizepath = get_attached_file( $image->ID ); and put this code after it
if (stripos($fullsizepath, site_url('wp-content/uploads/')) !== FALSE)
$fullsizepath = str_ireplace(site_url('wp-content/uploads/'),'',$fullsizepath);
Hope it would help you.
