I am using SharePoint 2013 as my company admin. We use 1 parent site and multiple sub-sites.
For the last couple of days, users that are on my parent site's "Members" list with the ability to edit are unable to add new items to a certain list using the "+ New Item" Link. when they click the link, they are getting an access denied message.
The users have the full ability to edit or delete any existing items, even add a new item when the list is in edit mode, but they cannot use the add new item link to access the new item form.
I have reviewed every permissions factor I can find on the site and in designer.