I found a solution for s4 league pc game from alaplaya.
The game hangs when it starts an exe file with name: hacking gateway client.
Until now i was disabling the avast's behaviuour shield for 10 min and the game started normally.
But i found that when i use compatibility mode for xp in that specific file(because i am on windows 7), the game starts normally with behaviour shield enabled.
So if anyone has the same problem with the game and avast behaviour shield and he is on windows 7, he can try to put the hacking getaway client(hgc.exe) in compatibility mode for xp sp3, and the game wil start up without the need of disbling avast's behaviour test.
This will work with avast version 6.0.1289.
Thnx for ur time.