Error in util.js (Test and Target integration with AEM)

When I run a test on a page, and include test and target (T&T), I get an error: Object doesn't support property or method 'deleteAllCookies'.

Is this a known problem, and is there a solution for it? Or can anyone shed some light as to why it is happening, and what can be done to fix it?

AEM 5.6 with cq-5.6.0-hotfix-2908-1.0.2.zip installed