Normally all online players should be visible. Possible reasons why that may not be the case:
- Connectivity problems between you and your friend
- One of you is running Schnopsn in the background
- You may be looking at an outdated version of the list of online users. Return to the main menu and re-enter Online Mode. This refreshes the list.
- You have won or lost too many matches in a row against that one friend (see our FAQ about the padlock)