I noticed that Intellij IDEA 12.1.4 (Community Edition) was not properly remembering my github login.
I was able to fix it using these steps:
- Close Intellij
- Delete the file security.xml from .IdeaIC12/config/options
- Start Intellij
The .IdeaIC12 folder can be found in the home directory of your user account.
Oleander Donovan's IT blog 
Thank you so much, it worked for me, I was trying very had to solve it