thanks for your reply and sorry for my English too.
I have the same problem. I already check the CURL like you said, and it run fine.
In general settings, PR shows all ok:
PHP Version: 5.5.15
MySQL Version: 5.0.95
Wordpress Version: 4.0
Enable Curl: CURL Enable
But when I click in save settings… white page.
Thanks a lot for you help!!