The game is unusable for me too.
I have noticed the following bugs:-
[*]On loading TWD on Mac OS X, it hangs.
[*]Switching to a window, I can see something is downloading something using a network monitor
[*]After 20 minutes, it eventually lets me in
[*]Trying to download Episode 3 hangs at 99.5%
[*]Switching between full screen and window often crashes TWD
[*]Quitting the game when in window mode crashes the game
Telltale support. Please can you address this asap or even respond.
I have found a fix of sorts! Tested successfully by four folks.
What you need is copy the following two directories from a working machine, or a copy from a friend.
/Users/"your user name"/Library/Application Support/Telltale Games/TheWalkingDead/SyncFs/Data/WalkingDead103
/Users/"Your user name"/Library/Application Support/Telltale Games/TheWalkingDead/SyncFs/Meta
Copy these two directories onto your own machine with the EP3 problem. Make sure you don't overwrite any other folders.
EP3 then works.