You have to check for the parameter 'start date' in your Workflows. I saw that you have assigned it to a new Workflow template you created. Without that parameter in your tasks/checklists the entries will not be shown in the workflow list!
If you change this you will see the 'start date' parameter in your task template again when you create a new task.

Unfortunately all the tasks created since this parameter was missing cannot be shown any more (unless you would like to change the code).

The timeframe for our next release (version 0.9.1) is a little bit dynamic, but we have set us a goal to release in the next days/weeks. So this version would be best to use, since our svn-version is surely up to date but is also most of the time work-in-progress.

Greets to sweden!