External SWF still playing when not visible

To stop externally loaded SWF content from playing, Unload SWF on hide must be selected in the SWF File Properties, and the loader must be hidden.

Even if the loader is a child of a different element, hiding the parent element on its own will not work, the loader still needs an action to hide it to unload the SWF.

See also

Add Flash SWF Element

Using the Skin Editor