Yes, it definitely made the odor worse. I was taking Odor Cleanse which is basically the same as Champex. I stopped after 2 week because my odor went from fecal to fecal and fishy. I felt like I had a yeast infection so I started taking Acidophilus. After about a week things were back to normal.
I agree with what ATA said in her post, it also made my BM's smell much worse...maybe it was eliminating some bad stuff.