@Virgin Glad you guys are working on it. I hope that you guys get an HTML5 based version going soon as the Flash version is almost out of runway.
Chrome stopped supported plugins in 2015. Firefox will do the same in 2016. Because of Flash's popularity the browsers do support Flash natively now.
The next step is "Click to Enable" on all but the Top 10 websites in the world.
I really love MyBalsamiq and hope it can make the transition.