I fiddled around trying different suggestions and ways to list and nothing worked. I hadn't made any changes to my categories since I started on EW, and then all of a sudden I wasn't listed in my category.
Here is what I did to fix the category issue I was having......
Make a completely new listing in the new listing manager (Important!---do not copy an existing listing, just cut & paste your info). Then choose a main category ONLY and NO subcategories (Important!---when you choose a sub-category, it will not work).
This worked and got me listed in the correct category within minutes. I tried the suggestions from Etsy Admin, and while helpful in narrowing down what did not work, it still wasn't getting me listed in the right category.
Because I had to make all new listings, I now have wholesale only listings, separate from my retail ones. I wanted to do that eventually, but that gave me a good reason to do it sooner rather than later.
Again, it has to be a new listing (no copy) with only a main category chosen (no subcategories).
Try one of your listings and follow the above instructions and see if that works.
Good Luck!