I instaled piwik into my own server and it seems to run properly. I have no errors whatsoever.
so I installed this plugin onto my WordPress 3.5 multisite edition and tried to network activate the plugin. I then go to the settings page, add my piwik url and token, click submit.
I end up with a 500 server error.
I checked the server log, but nothing is logged on this error.
I then deactivated network, and activated it on a per site basis.
I get the same error.
I get the error no matter whether I enter the url to my install http://mysite.com/piwik
or the path /home/mypath/public_html/piwik
If I manually add the js to my footer, then piwik works. It is just the plugin that does not work.