OpenX ads server on Esvon

Hello,
I'd like to put few advertisers on my sites using OpenX ads server.
I had tried this service on 3 different sites and everything is OK, but on my esvon site it's showing only google adsense but no other advertisers.
When I checked it using same html zone content on static html site everything is working nice.
What is going wrong on esvon? I had also disabled cache but still no success, any ideas? hints?

Thanks in advance,
BR
YacentY

Are the other adverts using PHP? If so for some reason Esvon decided to prevent third party scripts from running within the system, even if choose to accep the risk 

here is the link to this special html page with ads: http://www.gielda.agrofoto.pl/reklama.html
my esvon classified ads system is runing under http://www.gielda.agrofoto.pl
I have 3 zones and it contains same code like that html page.

So any idea what is wrong? Vladimir decided to charge me 80$ for investigating the issue, because like he told this is OpenX issue but from my point of view - NOT - because this system is running on many pages with success.
I don;t know what should I do. I had paid Vladimir so much for some analizes that I'm not sure if it's fair to pay once more - especialy I think this is some kind of bug or special feature of our sw

Within the code of the first link I see

cb=INSERT_RANDOM_NUMBER_HERE

Should that be changed to something else?

I think NO, why? because it's runing on my 3 different sites and everything is OK