A segment violation error message typically indicates a critical error that needs development work to be fixed. The error message of 'Runtime exception' and 'Segment violation' are generic and on their own do not point to a specific issue.
The 'AgileDesigner has stopped working' error message is not issue specific. ARD can crash due to a number of reasons. For example, defect (coding) issue, specific VTF (flow) related issue, compability issue, memory maximum reached issue, etc. Each crashing issue is typically unique and requires further investigation with our CA Support Team.