I am also facing the same issue, My Cases are getting appeared in Cases & Data tab, even the classes are also appeared in App Explorer, but cases are not getting appear from Case Explorer, getting following Exception
'Testing' is either not part of the current application
'Captcha Implementation' or not listed in 'Cases & data' of the current application.
Only case types listed in 'Cases & data' of the current application can be accessed using Case Designer
The Flow Action pre-processing activity pzGetSelectedCaseTypeDetails failed: ** Unable to load data page D_pzClassRecord. Required parameters : ClassName. cannot be blank