Front End Composer Not Working

When trying to edit a post or write a new post from the front-end of the site, it is going to a blank white page rather than opening up the composer window. The blog editor is working fine in the Joomla backend; it's only occuring when logging in on the front-end. I have turned on maximum error reporting but it's showing no error message. There's no error message in the console when I inspect the page in my browser either. I have it set to use the JCE editor, but I don't think it's a JCE problem because I temporarily changed it to TinyMCE and it still didn't work. I also tried clearing/regenerating the SEF URLs but that didn't help. What could be causing the issue?