Now updated to version 5.1, and the problem was fixed!
Thank you for listening! Thank you.
Understand! Did not add anything, might actually be some peculiarity of the theme or plugin.
A test that I can do is access by an external screen (http://bit.ly/aprendacsharp) and do some testing and try disabling plugins debug the submit = / Sorry that this process is a little work and is not so welcome be putting the site into maintenance, but I think that will be necessary.
Ok, Evan!
Links: bit.ly/aprendacsharp or http://diegob.com.br/blog/ (right)