I experienced something similar (not sure if the same situation), but I solved it checking database credentials and domain in civicrm_settings.php on wp-content/uploads/civicrm, may you could check if so.
Is it possible that your web server user is different from the user who owns the files or ran the installer? You can try deleting your templates_c folder. Also, check your Developer Tools tab (press F12) for errors, both on the Console and Network tabs. If you find any, please edit your question to include them, they likely contain crucial info.