What does the message "hook_flag_access: ignore" mean, and how do I turn it off? I currently have the flag module enabled, and I have placed a simple flag on a node content type. The flag works fine, but I'm getting a Drupal message / notification in green that says "hook_flag_access: ignore" when the node is viewed. 

It appears to be called by sites/all/modules/flag/tests/flagaccesstest/flagaccesstest.module

What does this message mean, and how can I fix / disable?

I'm using flag 7.x-3.1 on Drupal 7

Thanks,
Steven
Sounds like you need to disable the flagaccesstest module.

The problem is, in flagaccesstest.info the module declares

hidden = TRUE


So, it doesn't show up in Drupal module admin.

You could probably still disable it with Drush

drush dis flagaccesstest


or even (last resort) SQL:

UPDATE system SET status = 0 WHERE name = 'flagaccesstest';


Alternatively, in flagaccesstest you could comment out

;hidden = TRUE


and then disable the module from Drupal module admin UI.