See this sample. Gradient backgrounds seem to be working. Please let us know how you tried to set the background.

http://interactplayer.com/apps/xkTMN6EYzM6OMTM4gED...

Thank you so much for letting us know. I was able to reproduce this problem, and I've reported it to our lead developer.

If you'd like to use a workaround for the time being, you can use a global counter and behaviors with conditions that depend on the counter, as described in the Creating a Toggle for Narration, Language, etc. article.

For more information on InteractBuilder and InteractPlayer you can check our Reference Guide here:
http://interactbuilder.screenstepslive.com/s/5404/...
and our User Guide here:
http://interactbuilder.screenstepslive.com/s/5404/m/16264
And you can download a PDF file as shown in the attached image:

At this moment there isn't an option for this. I will try to find an alternative way to do this and will let you know.
Here is a sample app of a way to do this:
116 - Animation Random Time.zip

So basically I have a frame element (bike) that will do a static animation at a random time. The random time is dictated by an off screen intersection. The elements that are intersecting are:
an arrow that is doing a linear animation with replay with random duration
and a transparent element that is place on the arrow path.
When those two intersect, the bike will animate. We will not know when the bike will animate because of the random duration of the arrow animation.

Clint, we will check, but we did test your app in Windows and the clicking did 100% work.  We will verify this later today.