made a banner ad and it just stopped displaying content

I was working on a banner ad and once I cleared my browsers cache it stopped working entirely. 
I had also used shape tweens in my animation - those are the two changes I made and the banner stopped showing up entirely. 

What do I do? How do I fix this? 

Where do I even start? I am removing the shape tweens and can try to diagnose an error in the browser but this keeps happening with this animation format. I regret to say I prefer the old swf format as at least they were reliable in that sense.