Hi Roy,
Thank you very much for taking your time to help me with this 
Service seems fine in /iwfnd/maint_service, system alias is correct and when running it in browser it looks fine as well.
I have workflows in Business Workplace but they just don't get displayed through the service.
You say that I don't see them because of:
if you do have tasks in the BE , then one of the two happens
1. it's a task from an activity step , and hence need to be properly externalized
2. it's a task from a user decision step and someone enable the filter flag (you can disable it or do the same as follow)
The task filter is disabled so do I still need to perform the steps in "Maintain Task Names and Decision Options" that you describe becuase the documentation (below) says it is not relevant without filter enable?
Maintain Task Names and Decision Options
This activity allows you to maintain workflow tasks that need to be included
in the task filter together with their names and decision keys.
These customizations are relevant when the filter is active. When the filter
is not active, all workflow items are read and all notifications are sent.
Also it puzzles me that I can't invoke a breakpoint with the debugger - any hints regarding that?
BR Jan