I am running a Shattered Star campaign and I am wondering which add on books I should allow.
There are a lot of books out there and I am thinking of allowing only a few non-core rule books. Since it is taking place in Magnimar I would allow the "Magnimar, City of Monuments" book and "Varisia, Birthplace of Legends" since it is PDFs that one player already owned. However I am also wondering if I should allow the Inner Seas 'x' books, you know, world guides, primer, magic, knights etc.
Are there any really known buggy things in any of the inner sea books that I should be mindful of? And are these book selections good for any Adventure Paths?