QTR-Quadtone RIP

I am very grateful for the help so far. But some strange things still 
occur in 2,5. (Earlier version works fine - but I have a 3800 too ...)

When I start the program it gives this message "42519,6 is not a valid 
integer value" and after that it resets the .ini-file to default. 

When switching to the 3800printer the curves correctly shows "none" 
since there are no curves for this printer yet.

When I switch to the 4000printer, QuadTone repeats the error 
message "42519,6 is not a valid integer value". When I open the curve 
tool it start by saying "ppd was not found"

(This is an installation on Windows XPpro)