These instructions are for WaspTime v3 or v4 only.
You need two things to get the over midnight shifts to work.
1. Make sure they have a schedule template in the Group Schedule Tab
2. Make sure the Overnight Rules setting in the In Out Rules tab of the group window is set to enough hours to cover the whole shift plus a few hours. So if the shift is from 10pm to 6am the overnight rules setting should be 10. That way if they punch in a bit early and out late they are still covered.