run a background script to see if gs.log statements are working or not in the first place. Check the results in Script Log Statements Module. 

If you find the log statements from the background script then logging is not disabled  in your instance, and the root cause may be the function in the script include is not being called. 

In very rare occasions i saw the system property glide.script.log_level set to None , which disables gs.log statements in Global Scope. If you dont find this property in your system properties that's fine(it doesn't come by default, we have to create it if we want to disable the logging)

glide.script.log_level