Thank you for your post.
Our Development and Testing departments are aware of the scripts not displaying in the scripts pane of the Script Workspace under macOS Sierra 10.12.x. This is usually caused by scrolling up and down the scripts pane. I have attached your post to the original report. When more information becomes available, I will post again.
I have not encountered your issue with the Inspector alignment not showing multiple objects have been selected, and I do not see any similar issue reported. Please provide more information about your layout (parts, size, objects, etc.) so I can try to replicate this issue.
1) play around with selecting by drag function of mouse until the select area remains as shown in the screenshot.
2) Now try a select by dragging the mouse or select multiple objects by clicking and holding down shift key. It does not happen every time but often enough. Of course I have no clue as to why ... it just gets on my nerves ;-)
This issue has been addressed in FileMaker Pro 16.