After installing jBPM using the standard ant demo.setup task, I opened up the jBPM console followed the steps below:

1. Log in as peter
2. Create instance of VacationRequest process (Example with Task Forms)
3. Open Group Tasks and Claim the task
4. Open Personal Tasks and Click "View".

Expected Resut:
Task opened with details as specified in request_vacation.ftl form

Actual Result:
Pop-up window with error message "The task doesn't provide a UI"