[imp] contacts.php blank window in compose

[juan carlos]

This problem only appears in contacts.php when i composed a mail, shows me a 
blank page. I read this link 
http://wiki.horde.org/FAQ/Admin/Troubleshoot?referrer=FAQ%2FAdmin#toc2
I didn'f find a solution on this link, appears the same problem. Please help, I 
can add, browse, search contacts from address book, but when i'm composing a 
message and hit the address book button, i get a blank window (contacts.php). 
How can i fix this problem? 
Thanks