here’s another one who has this probleme. My PIWIK tracks different pages with different urls.
As mentioned before, it should be possible to edit the x-frame-options.
As a hotfix: can anybody tell me, where to find this option in the sourcecode of PIWIK?
I have changed to the Plugin “costumOptOut”. This one calls an own iframe. And that modul doesn’t send the X-Frame-Header. So it works with different third-level-domains as well.
Attention: You have to change the embedded iframe-source-data!