My wild guess based on prediction would be that you are trying to run AS7 with JDK8 which results on hang on boot as you descibed.
Why it started just this week? you probably installed JDK8 or changed defaults of Mac.
In short use JDK7 to run AS7 or upgrade to WildFly 8+ to use it with JDK8
Thanks - upgraded to AS 8 and it is now installing. Off to the races!!