
I've experience trading limits myself. I had them for resale of certain software items last fall. Essentially, (from my experience) they limit the number of items you can list in a category or class during any 7 day period. I think my prior limit (removed after about 60 days) was 4-6 per week. It only applied to that class/category, and didn't affect my other auctions. That limit also disallowed revisions to items in same class/category (like they are keeping count against the limit). I guess they are trying to stop possible changes to sneak things in...under the restriction. That sounds like what you might be having.
I was literally cleaning out my bookshelves and closets of old full licensed software, so I wasn't in any hurry or felt the restriction was unjustified.
Danno