tetex 3 & prosper

Hi,

I was wondering if someone got the same problems as me with prosper
under tetex 3.0. Basically processing most of prosper documents
(or prosper based like for HA-prosper) with pdflatex, I get the error:

! Undefined control sequence.
<recently read> \c@lor@to@ps

(for instance this happens on the example HAPBigtest.tex
of the HA-prosper package). I tracked the problem up
to semcolor.sty, and seems that this behaviour is introduced
by version 1.01 of semcolor.sty, which does:

\RequirePackage{pstricks}

instead of

\input{pstricks}

In this way pstricks.sty is loaded before pstricks.tex.
I tried also with pstricks 2005, but I got the same errors.

Note that even reverting the line \RequirePackage{pstricks}
to \input{pstricks} in semcolor.sty ends in a error:

! LaTeX Error: Unknown graphics extension: .ps.
See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.

Has anyone seen this problem too? Is this a known problem?
Are there patches available? And where exactly the problem?
In pstricks? In prosper? Or other color packages?

Note that this behaviour happens with both prosper 1.5 and 1.6 from CVS.
Also it happens only in pdflatex but not in latex.

Thanks.
Bye.
Giuseppe.