Hi Martin,
Well, thats not something that would/should be obvious! I think Michael plans on tuning this up to not have to be in that flat plane direction to work. It was just a limitation of the first, original implementation of the new flow command... Should get better in the next couple releases as these types of things arise...
(The normals are read from the surfaces, not the viewport. A better way to understand it)
Good luck.
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