SYMPTOM:
A document containing a multimedia widget with non-square thumbnail images correctly renders upon document execution but images are distorted into squares as soon as users first interact with the widget.
The following screenshot shows multimedia widget just after document exection:

The following screenshot shows the multimedia widget once the user touched the widget at any area.

CAUSE:
This is a known issue with Strategy Mobile 9.3
ACTION:
This is fixed in Strategy Mobile 10.