Link Task not working in Incident form.

I have cloned the default incident process to a new one.  I have 2 categories one mapped to the original incident workflow and the second to the one I cloned.  I did some modifictions to the cloned one and works fine for me except in one thing.

The problem is when I click on Link tasks in an incident using my modified workflow it shows nothing.  It doesn't attempt to display the task categories however if I create an incident using a category mapped to the original incident workflow it pops up the category tasks.  I know the first thing is check your modifications.  I need to know where should I troubleshoot as I am 100% sure I have not changed anything related to task.

sm used 9.61