I have two different panels layouts - one for editing, the other for adding nodes of the same content type ("Contact Details").
A panel page for overriding 'edit' pages exists in Panels (in code), which I have activated. I've made a variant which works for 'edit' pages, but it is also overriding the 'add' page with the same layout.
I've added a context of 'Node add form' with 'Contact Details' as the 'Node type'. Also added a selection rule:
Node: type / Node add form is type "Contact Details"
Both forms still appear in the same panel layout (the one for 'edit' pages).
Help much appreciated :)