[Fractint] color cycling in Xfractint

Hi folks. It's been about 8 years since I last played with Fractint-- back then I was using the DOS version. I recently downloaded the latest source and compiled it on my Linux box. For the life of me I cannot get color cycling to work. From what I've read I press 'C' and then '+' or '-' after an image is loaded. I've tried this and it does not work. I'm using XFree86 4.2 and KDE 3.02. I've combed through all the documentation and I think Google is sick of me right now. Can some help me out with this? James