I’m afraid, but it’s not sure the problem is with 2.12 version.
As I posted here : https://ww.wp.xz.cn/support/topic/connect-but-no-data-in-piwik?replies=4
After two updates of wp-piwik (thanks for that) we have today configuration : “You are using Piwik 2.9.1 and WP-Piwik 0.9.9.15” (we are hosting by Piwik pro and they said it’s last version)
And always no data.
