Up until 2018, LawLab did not require mandatory fields in the party information. This changed when Interview was introduced, making Last name, Gender and DOB mandatory fields. As a result of the upgrade, there might be some glitches if you have really old cases where parties are missing one of those fields.
Glitches include failing to update information in Case details such as Preference Category, Priority Date, or Chargeability. It is also possible that the party (and maybe the case in which that party is a member) is “hidden”.
After the upgrade, if you experience these glitches (inability to update Case details or not finding a party in a case), then the solution would be to verify that your parties in that specific case all have a Last name, Gender and/or DOB assigned.