Thank you Héctor.
I’ve updated the plugin to the latest version (2.3.5): disabling the plugin, overwriting old files with new ones and the activating WPP.
It give me an alert “Your WordPress version is too old. WordPress Popular Posts Plugin requires at least version 2.8 to function correctly.”
While I’m using WordPress 3.1.4
However we’ll see if the data will be recorded correctly, at the moment the “7 days” tab is empty, while others are ok :-/
I confirm the same problem!
Probably a WordPress server error?
Riccardo
I can’t change server side, so I fixed this problem simply rewrite the wp-include/db.php like suggested here.
But now the problem can be showed again on the next upgrade..