Hi Jason:
Welcome to Atkins and the group too!

Yup, corn syrup is a sugar, as is dextrose, maltodextrin...etc
It comes in many tricky forms. The corn syrup will show up as a sugar under the carbohydrate listing. Corn syrup is a no-no

I use italian dressing that has a little sugar in it but I only typically use under a tablespoon of dressing because I'm not too nuts about Italian (keeps me honest though).

You may be able to find creamy dressings that have no sugar in them (perhaps in the diabetic section of the food store).