Page overlay doesn't work with SSL 2.16.1

I’ve tried implementing this before, and it didn’t work, but since one of the last updates there is actually a notice recommending to upgrade to a secure connection.

I just tried again, but for some reason when in SSL (force_ssl = 1 - even in a new private/incognito window), the page overlay feature will not work, I’ve checked with the sever company and they can’t see any reason why this is not functioning as expected.

The only error I see in the errorlog for today is:

[01-Mar-2016 16:44:49 UTC] PHP Fatal error: Undefined class constant ‘MYSQL_ATTR_FOUND_ROWS’ in /core/Tracker/Db/Pdo/Mysql.php on line 81

Works just fine without SSL

No one else is having this issue?

Could it be that you are having this issue: Inform users about possible issues with Page Overlay report · Issue #9807 · matomo-org/piwik · GitHub

when overlay does not work, do you see any error in your browser console?