THIS ISSUE HAS BEEN RESOLVED IN TURNINGPOINT 5 FOR MAC VERSION 5.3.
When attempting to connect to an integration with a forward slash '/' at the end of the URL, the application freezes unless the building block itself handles the malformed URL. The problem stems from the fact that the resulting webservice call now has a double slash '//' in its URL. The response from the service is an 'Invalid URL' web page. The application continues to try and process the data, causing it to freeze.
Update to the latest version of TurningPoint 5, available for download here. If the user cannot update the software, remove the '/' from the end of the URL in the Integrations Wizard.