When I try to print to one of our printers from my layout in PRO, I get "unknown." Printing to this same printer from ArcMap works fine as always. When I tried to print to a .pdf, it just kept spinning for an hour while I was at lunch! The layout is from a map series, but I definitely checked the box to just print the one page. I just read one post from a User that said printing from PRO is "inviting the devil." Actually for my purposes, I'd be able to use the print to .pdf, but can't even get that to work.