QTR-Quadtone RIP

At home I have tried QTR with my epson R800 (not R1800) and it seems
to work fine....nice prints with gloss optimizer.
I wanted to try to make a print at school on the R1800 using the same
curve (so opened it and saved it for the R1800), but it doesn't want
to print the "gloss". I really tried all possible but without success.
I even replaced the R1800 with another one , but still the problem
remains.

I'm suspecting that there must be something wrong with the QTR driver
for Epson R1800 . Maybe someone experienced the same problem?

Hopefully someone can help me with this.

Thanks in advance,
Herman