Re-edit post problem

I am in love with ACF but now i have this:
I have just updated WordPress & ACF, now i have a problem with the custom fields.
When i try to re-edit a existing post and press “Save” / “Publish”, de custom fields are empty after the page saved and they disappear on the web page.

How can i solve this problem??

http://wordpress.org/extend/plugins/advanced-custom-fields/