Finally I found the problem / solution
After 1 day trying everything a found out that problem is with "first time registration wizard" of open office.
I didin't even think about it because I ran the wizard logged as user used by "service" so I thought everything is fine.
But it wasnt. It seems that service doesn't use all profile info of user and oo dinn't know that wizard was already ran.
What helped was applying small code which disabled wizard for all users
Downloaded here: http://wiki.services.openoffice.org/wik ... ion_Wizard