Í now tried to use Classic Server, because it was suggested for
dualprocessor machines, but now get a strange problem.

If I use functions of my UDF library, I allways get errormessages.
For example I have a UDF which returns a string as result, I get the
following error:
ISC ERROR CODE:335544382

ISC ERROR MESSAGE:

return data type not supported


I do not get any errormessages with the same UDF, the same database
and the same statement when I use Superserver.
Is there anything I have to be aware of, when using UDF on classic
server?

Kind Regards
Helmut