You should check your openx site configuation file, located in the openx /var folder. This file is named yourdomain.conf.php, so your's should be named www.delphifontes.com.br.conf.php
This file contains a couple of sections, each starts with a section name in brackets, i.e. [file], [webpath], ... - similar to the good old Windows 3 ini-files.
I assume, the [file] section is somewho missing the value for the click script, a line which reads:
click="ck.php"
As a result, the rendering engine of openx fails to build correct click-Urls. The complete "file" section should usually look like:
[file]
click="ck.php"
conversionvars="tv.php"
content="ac.php"
conversion="ti.php"
conversionjs="tjs.php"
flash="fl.js"
google="ag.php"
frame="afr.php"
image="ai.php"
js="ajs.php"
layer="al.php"
log="lg.php"
popup="apu.php"
view="avw.php"
xmlrpc="axmlrpc.php"
local="alocal.php"
frontcontroller="fc.php"
singlepagecall="spc.php"
spcjs="spcjs.php"
xmlrest="ax.php"