To reset the 'GUI' from the back end, the following might be helpful:
The form that holds solution questions is COL:CASE:Solution_Questions. Error is coming from the workflow that is checking the following:
('Solution_Key' = $Solution_Key$) AND (('Question_Type' = "Multiple Choice Branch") OR ('Question_Type' = "Multiple Choice Selection")) AND ('Status' = "Unconfigured"). You can open the COL:CASE:Solution_Questions form directly and check for ('Status' = "Unconfigured") and delete all of the unconfigured questions so you can activate your solution. Be careful with deleting questions that might have configured 'child' questions under them - I don't think you will be able to configure lower level question before the 'parent' is configured, but not sure.
I don't have any insight on why GUI is not displaying data correctly - hopefully product team can provide that.