Cant click 'allow' in flash?

Hi guys

I wanted to do a webchat through a flash applet thing and a little dialogue box popped up asking me to accept or deny access to my Mac's Facetime camera. It won't let me click anything.

This happens in all my browsers. I googled this problem and it looks as though a fair few people have it and I haven't stumbled upon any fixes. tips appreciated....

 

Thanks