You must pay very close attention to the format of the URL indicated in the URL targeting filter.
The most frequent causes of error are improper settings in the target, which may cause your test to fail to be triggered for the pages on which you expect to see it.
Another frequent error is improper protocol: you have entered a filter like Contains http://www.example.fr but some of your pages are secure and use the https protocol. In this case, you should have used the Contains www.example.fr filter.
Also, pay attention if your URLs contain optional parameters like tracking parameters. If you tell it to target the page whose URL exactly matches http://www.example.fr, you will not target the variations of this page, like http://www.example.fr/?utm_medium=cpc&utm_source=yahoo. So you should use a Matches the regular expression: ^http://www\.example\.fr\/(\?utm)?$ filter.
To learn more about regular expressions: http://www.rexegg.com/
To test your regular expressions: http://rubular.com/