Lines Go "Crooked" When Moved by Keyboard Arrows

Thomas, this bug has been around for quite some time. One of the more recent forum threads:

https://community.articulate.com/discussions/articulate-storyline/the-line-changes-its-angle-automatically-when-moved-vertically 

Back in August, I prepared this video illustrating the problem for Articulate Support to review:

https://360.articulate.com/review/content/7179c4b4-03f4-41c9-a6ab-afc46df08aab/review 

As noted in the video, a workaround is to click the line (rather than select it via the timeline or by clicking and dragging around it) before moving it. That's an easy fix when you have one or two lines to move but very time consuming if you a whole bunch of ungrouped lines to move.

My support contact was able to replicate the problem in a sample file I provided but I'm not aware of a permanent fix yet.