QTR-Quadtone RIP

Hello All,

I have an old Quadtone ink 3000 set-up in another room that I slowly
progressing on.

I tried a print tweaked with BWorks Heavy Sky filter.

Some of the tones are reversed. Specifically, like the black didn't print.

The epson driver printed it OK.

Do I have to watch for something like (I dunno) dynamic range when run an
image through Quadtone RIP?

The image was digital sRGB capture and it looks to be a 256 color RGB now.
Did this filter mess-up the colorspace or did I just give Quadtone a
defective image??

Any feedback would be useful.

gar