Hey, thanks for your help! I started trying your solutions, then a friend came up with a solution:
In the event, you need to 'Insert new condition' -> 'System' -> 'Trigger once while true'.
Apparently, at least in my case, the event is checked every tick and the program cannot cope with that (it's an assumption, I won't claim to understand the underlying happenings of construct ).
Thing is, that solution did not work with my example .cap file that I provided, but it did work with my main program... having looked at your topic where you provided the link, R0J0hound provided a (more elegant?) solution to your problem, so hopefully your problem will also be solved!