Hi Valerio,
Thank you for your quick answer.
Here is one screenshot where I started to type “posts” in the field -> https://stockageftp83.free.fr/wordpress/PNBE_screenshot_conditional_settings_1.jpg
Screenshot where I start to type one of my tag. I have the same behavior than with “posts”field but there at least I see “no matches found” (don’t know if it helps you..)
https://stockageftp83.free.fr/wordpress/PNBE_screenshot_conditional_settings_2.jpg
WP 4.1
Using English language.
Thanks a lot Valerio and tell me if you need more info.