Symptoms

Empty enhancement created by Guest user.

 Cause

User session timeout. 

Resolution

The cause of this behavior can be seen in the node logs below:

 Default-thread-14 07B8496ADB17A3001EBB41EFAA9619F5 txid=455d6e2adb13 Session destroyed: <Session ID>, (not logged in)

Default-thread-14 07B8496ADB17A3001EBB41EFAA9619F5 txid=455d6e2adb13 Inactivity time changed from 1800 seconds to 7200 seconds 

Default-thread-14 07B8496ADB17A3001EBB41EFAA9619F5 txid=455d6e2adb13 Session created: <Session ID>, timeout after 120 minutes of inactivity 

This is expected behavior for a session timeout. This is only allowing "Guest" to create due to the timeout. 
Please note, you do have a Guest user account which is active and not locked out.