I have stragne problem.

I have tried three diferent housing packages (modified distro 1.0, official distro 1.1 and WoD96 housing), and all of them work good on pol95 and pol 97.

But while installed on pol 96.7 (WinXP), when i try to build house from deed doors and housesigns just disapear.

They're all visible on 'ghost' home that appears on my cursor after clicking housedeed, but they are gone when house is build.

The transparent picture you see on your cursor is entirely client-side.
When you place the multi, some stuff becomes a dynamic server-side item.

You need to have entries for the signs in an itemdesc.cfg
See the distro housing package for reference.