Sumulation of Sequence Diagram

[rhtt]

Hi, I've read the doc and can't see to get a Manual or Interpreted simulation (click through) of my sequence diagram to work properly. I drap classes onto the seq-diagram, connect them with messages/calls to operations, set breakpoints etc., but when I click "run" in the simulation window I first get a grey screen and when I hit "single step" the simulation is already done (according to the output in the simulation window). It looks to me like the simulation starts, but then just blows buy all of my message/call connections trough to the end, ignoring breakpoints as it goes.

I am using Version 11, Software Engineering edition.

What am I missing? Additional info needed? THANKS!!
 

[qwerty]

You need to place the image on a public server. Then you can add the link to it with the image icon above.

q.

[rhtt]

Anybody have an idea or tip for me? Thanks!