I have been having a recurring problem with a wordpress site someone else made and I help maintain for a client. The permalinks refer to the page id only (.com/page-id=123). When I change them in settings/permalinks to show post-name. It references a problem with the htaccess not being writable.
When I change the code in the htaccess to make it writeable, the links change to how i want them (.com/mypage) but it returns a 500 error and says the page doesn't exist.
I have been reading other forum posts but cannot seem to get my site to work with the simple permalink form. Any help is appreciated.