Hi all,
I got this problem with the page Overlay on each Piwik profile, it looks like it’s loading but then I got the error “This content cannot be displayed in a frame”.
I tried with different browser but the issue is the same.
I came across this link on piwik Page Overlay – Visitors Click Map - Analytics Platform - Piwik and I checked the settings in Piwik, the Overlay plugin and Transaction plugin are Active.
Could anyone help me with this?.. 
Thanks.
Jacqueline Zepeda