I don’t know the specific details of your environment, however, if it were my installation and my environment, the first place I would check are the plugins.
Go into your server and delete or change the name of the plugin file to disable it. One by one until you find the plugin making the trouble (unless you have an idea of a plugin that may be acting out of sorts). Then send the plugin developer an email to see if they can recreate the issue. I’m sure they’d like to know if their plugins are acting funny in certain environments for stable future releases.
The next thing I would do (if the aforementioned did not work) is manually upload WP again after backing up my MySQL DB and my wp-config.php file.
Hope this helps!