When Placing a Horizontal or Vertical constraint on a sketch block the direction indicator (preview) seems to display the direction relative to the sketch block geometry rather than the sketch orientation.
Horizontal and Vertical Constraint Indicator Displays wrong for Sketch Blocks
He he... you must be new to Inventor.. 
That is one of the biggest confusing things in Inventor and no one can agree on whats the right way/wrong way to handle it all..
Discussions all over the place about it..
Is horizontal supposed to be "as you are seeing the screen" or in relation to Z or X or Y or initial sketch or whatever..
Watch it again.
I'm not saying it should be horizontal to me, I'm saying it should be consistent in the same sketch.
I'm Still on 2018.1.2, haven't gone to 2018.2 yet.
I highly doubt it fixes this.
Hi! The behavior does look confusing. Indeed, I don't think it is fixed in any Inventor release yet. There is a logical explanation for the behavior though. It is possible the sketch coordinate system used to define the sketch block is 90 degree off the current sketch coordinate system.
Please feel free to attach the part here so we can confirm it.
Many thanks!
@andrewdroth as counterintuitive as it looks, when inspecting the example, @johnsonshiue is correct.
If you rotate the sketch block, then edit it, the vertical constraint matches up with the vertical of your box.
It seems dependent on when it was set and that is the orientation it will keep.
If you explode the sketch block and try to rotate it you get a constraint error so it's kind of a good thing.
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Kelly Young
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I understand why it's happening, but those indicators should be true to the sketch and not to the block origin.
OK, this is clearly broken...
Hi Andrew,
The behavior is wrong. I am not able to reproduce it using the file you attached earlier. Could you share the new file here?
Many thanks!
Hi Andrew,
Never mind! I can reproduce it now using the original file you attached. Simply redefine the sketch plane based on YZ or XZ. The behavior can be reproduced. I think this has something to do with double transformation. Editing a sketch block is essentially on the original sketch plane on top of the current edited sketch.
I have seen this behavior before but I don't recall the technical reason why it cannot be fixed easily. Let me check with the project team and see what we can do.
Many thanks!
