Fixed problems with psychometrics (Opaque Keys)

@carsongee Some simple fixes to get psychometrics working again:
- Update key comparisons for Opaque Keys
- Search for 'problem_check' instead of 'save_problem_check' when
  filtering TrackingLogs.
@bdero can you please verify that your referenced commit actually appears upstream? I'm a bit nervous that you reference a commit in a fork.