Flash Builder 4.7 becomes unresponsive when trying to add 5-6 source folder under Flex build Path

Hi,

I am facing issue with Flash Builder 4.7.

Whenever I am trying to open any mxml or .as file after project setup, flash Builder 4.7 becomes unresponsive without showing any error message or popup.

At the initial project setup, I am able to open file but when I try adding 5-6 source folder under Flex build path->source path, it’s become unresponsive.

Everything works fine in Flash builder 4.6, but I have license key only for flash builder 4.7 and want to use Flash Builder 4.7.

Please help me to solve this issue.