webservice that works locally returns empty results when deployed?

[peterlan]

Hey everyone,
I've built a webservice that's a wrapper for NFop. It takes in an FO
formatted xml (in a string), and returns a pdf in a byte[]. Works fine on my
local system (xp pro). When I moved the web service to our production server
(by copying the project and creating an IIS app), everything seems to work
fine, however the byte[] array always comes back empty. No error is being
returned on the client-side of the webservice, and I can't see any errors on
the server, it's just empty. I didn't rebuild anything, I just copied the
whole project from this machine to the other.

Anyone have any ideas what this might be? It seems like some kind of
configuration thing, but I'm inexperienced with webservices.

Oh, and I can view the web service definition in IIS (ie
http://server/ServiceName/service.asmx displays fine).

Thanks in advance!
Peter L