LinuxQuestions.org - Samsung CLP 510 and Epson Photo R320 driver conflict?

I have 2 printers installed on my SuSE 10.0 system: An Epson Stylus R320
and a Samsung CLP-510 laser printer. (The Epson uses Gutenprint for it's driver while the Samsung driver was installed from Samsung's CD) Is it possible for the driver for the one printer to influence the driver of the other one? The Samsung printer shows up as lp.

What is happening is that when I use the Epson printer to print images in SeaMonkey 1.1.1, the images are printing extremely dark and does not respond to any changes (brightness/contrast) I make in CUPS. (Seamonkey 1.1.1 was not installed by an rpm, I used Mozilla.org's installer). Also, I've just tried some experimental prints from Konquerer and FF 1.5.0.10. They both print the images extremely dark (nearly all black). They don't seem to respond to any gamma setting changes made in CUPS either.

I also tried an experimental print from Open Office. It did nicely and responded to the changes I made to the composite gamma setting so OpenOffice does not seem to be affected. I've read on the CUPS forums how OO.o treats ghostscript differently. I wonder if that's why OO.o is not affected. Anyway, I'm glad it's not.

I know that something is wrong somewhere, can anyone please help?

I'm using Gutenprint 5.0 rc3 and ESPGhostscript 8.15.2 and my kernel is
2.6.13-15.15-smp (on SuSE 10.0) and I have CUPS version 1.1.23