Support material causes useless loop movements

Hello,
i think the following is a failure and that someone can help me. Although i have not found anythink similar in any forum:
I use pronterface with sceinforge, what works in general fine. But if i add support material (raft, elevate nozzle, ...), the nozzle moves several times over the printing area without extruding - and that it does at every layer. The result is not only a strongly increased printing time, but also problems with the extruded material. Sometimes after that pause the material is not transported anymore.
On the attached picture you see an example of the pathes, the blue lines are movement without extruding if i am right.

Thanks in advance for helpfull comments.

i did some googling for you. here are some settings for skien forge

[blog.thingiverse.com]

Thanks, but unfortunately that didn't help. Maybe the failure ist somewhere else, because i have played with all the parameters in raft but it did not change anything.

Do you have "Comb" enabled ?

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Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.

No, thats not it