When I installed it initially the plugin worked and delivered data to Piwik.
I am only monitoring a single site.
Of course, I had to go and screw around ... and then added SSL certificate to my subdomain from where I run Piwik - which then promtly broke it in WordPress.
I kept getting the "error occurred" message in the plugin settings dialog and no Piwik js was being produced in the pages anymore.
I have deleted the wp_pwik entries in the options table, deleted and reinstalled the plugin - and out of desperation even deleted and redid the install of Pwik.
It still gives the same error message and will not produce a tracking code.
If I add the Piwik js to my footer, the tracking works perfectly.
http://YOUR_PIWIK_URL/index.php?module=API&method=SitesManager.getSitesIdWithAtLeastViewAccess&format=Html&token_auth=YOUR_AUTH_TOKEN and it returns "value 1"
What else can I try to make it work? Any ideas please?