Found serious bug in recent Storyline 360 version 3.17.16117.0 - all arrows with either width or height = 0 are not displayed in preview or published courses. There is no such an issue in Storyline 360 version 3.16.
If you have any horizontal or vertical arrows in your courses, then consider to postpone update until the next version with this issue being fixed.
UPDATE: Issue was fixed in Storyline 3.17.16168.0.
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