Trouble publishing posts & images

I set up a blog for a client, installed a theme and a couple basic plugins, and all was working fine. Shortly after, client stated that he could not publish any posts or images. When I try to publish a post, only the title of the post appears and no text or media appears. I’ve tried re-uploading wp-includes and wp-admin folders, along with the included php files from the wordpress download, but to no avail. I’m still learning the in’s and out’s of php and how all this works together. I’m sure this is an easy fix but am still stumped. Any suggestions are VERY appreciated.