Image is broken preview and uploaded state in uploading sequence+issues

Hello everyone, i've problem about broken image uploading. In this issue image was broken preview and uploaded state in uploading sequence. I appreciate any help. Thanks in advance.

Our system:

uname -a

Linux centos6 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011 x86_64 x86_64 x86_64 GNU/Linux

ruby -v

ruby 1.8.7 (2010-06-23 patchlevel 299) [x86_64-linux]

gem -v

1.8.11

Wagn v. 1.7.1 install at  Nov 17 14:13 via git.