Are you taking any kind of fiber suppliment? Maybe you are getting too much fiber from the veggies.

It could just be your body needs tiem to adjust to the roughage too. There is a favorite thread on here that talks about constipation and diareah when switching to low carb. For some people the raw veggies can cause problems at first. I know you have been Lc for a while, but the raw veggies are a newer thing. Maybe try cooking them for a while and grasdually ad din small amoutns of raw so you get used to them again.

Make a wilted salad. Brown meat, and leave some of the grease. Then toss in salad greens and cook until they look like cooked spinach.