Hello, I have a similar problem. Until a month ago there is no any problem, but now I cant access to all pages on other languages through a menu. To be clear, I have a home page in serbian language, but I cant add home page to main menu on other languages, because home page on other languages arent visible in the list of all pages even I have created them with polylang. The same thing is with other pages. Also the Same thing with the categories
