Object intersection not working

Hey all,

I'm builing a little 'search and find' mock up but as soon as I add in the 'when object intersects' trigger, the whole thing craps out and preview just sits there trying to load.

Here's the mockup; https://360.articulate.com/review/content/3c1d296d-4f66-4cab-8ad1-867903f207be/review

I've got my scope set up as an image and then added an invisible shape over the crosshairs and grouped the two of them together. 

Here is how my trigger is set up; 

I'm guessing the problem is simply that the invisible shape doesnt like to be in a group for that particular trigger to work...

Any ideas how I can figure out a workaround, I've tried;

• 'mouse hovers over'
• 'object dropped on'

But not getting anwhere! 

Thanks :)