Print Processor in Windows 7

Hi all,

I have an issue with an own print processor developed with the WDK. My own
print processor is working properly in Windows XP and I've now recompiled the
source code with WDK 7.1, everything seems to work (the code is compiled
without errors and I can register the print processor without problems in the
system), but it really does not work at all. I have no idea what is happening
and I can not debug the program (VStudio does not stop at the breakpoints and
if I try to write some traces in a file I get an empty file).

Has anything changed in the way of creating a print processor for Windows 7?

Greetings