Thanks once again for your patience and efforts! At the moment it is an "either - or" situation.
It obviously is an incompatibility issue. Both tools (the template and the component) work perfectly on their own, the problem only comes up if you combine the two.
As both tools were (gladly) paid for
- and I am not a programmer
- I need help... And as both sides (Joomlapolis and Opensource-Excellence) have a record of being willing to help
I am sure (well, hopeful) we will find a solution.
I will report back....