Thanks Helen for comprehensive answer.

> Next, the error message is telling something more interesting than the fact
> that the server can't get access to the UDF directory. It is saying that
> you have included the ".so" suffix in your UDF declaration. If it is
> there, it should not be; and it must be removed for RESTRICT. (Or some
> name-scrambling is going on, due to your having leftover pieces from Fb 1.0
> in the path...)

Why ".so" suffix should be removed? I have servers where FB 1.5 was installed on
clean Red Hat and it has been working for months.

> Next, the keyword in firebird.conf is RESTRICT, not RESTRICTED. The

That's my typo here in the message - firebird.conf is ok

> You could try changing it so that the path is not relative, i.e.
> UdfAccess = Restrict /opt/firebird/UDF

I have tried this - no luck

I think the main reason is what you suggested first - do not install FB 1.5 over
1.03. Some garbage is messing here. This is not the first time we install Fb 1.5
but as I can see now - all previous installations were done on clean system.
I will have to uninstall 1.03 first, then I will try remove anything that might
be related to this version.
Then FB 1.5 will come ...

As for relase notes - I have studied them several times from beginning to the
end and back. I don't speak French ;-) so I prefer original English version of
that.

Thanks Helen once again

Marcin