I had a same day round trip and called the WP service center when only one way posted. The rep said "the computer sometimes doesn't like that" and said he'd put in a request for the miles to post. He said I should expect to see them in a few days. I'm not too worried as NW has proved to me time and time again to be eager to earn my business through great customer service. I recently used the BUMP program to switch a CO flight over to a NW one. The flight posted as a CO codeshare even though it wasn't actually one. I sent in a fax with my boarding passes and the service center switched them to NW flights (so I could receive Mile-A-Rama credit) AND posted them at full Y/F fares to thank me for giving NW the marginal revenue. Thanks NW!