Magnets not working?

[Peter Stöhr]

Hi all OmniGraffle Users,

I'm having a little problem with magnets using OmniGraffle (2.1.1. 
v34.20).
Magnets are enabled (Format->Connection Magnets) and visible. 
Unfortunately, the are not used while drawing interconnecting lines 
between the objects.
Am I missing something?

Greetings
     Peter