Using the Vanilla launcher - the game exits without an error message nor returns to the launcher after I select the new Forge profile created by the [1.7.2-Forge10.12.0.1024] installer and press 'Play' 
  
As a precaution, I deleted my 1.7.2 and Forge folders from my 'versions' directory and also the profiles from the launcher. 
  
Re-downloaded 1.7.2 and started a freshly-made un-modded single-player game world using a default 1.7.2 profile. 
Installed Forge using the [1.7.2-Forge10.12.0.1024] installer, selected the 'client' installation option. 
Re-opened the freshly made world, using the default 1.7.2 profile, again. 
Then tried to launch a new game using the newly created Forge profile.  I got a loading icon on my mouse, then nothing.  No error message, nor a return to the launcher. 
  
I have attached (2) fml .log files.  There are no corresponding crash .log files 
  
Let me know if I have missed anything. 
  
fml-client_.log 
  
  
  
fml-junk_.log