I am currently testing page overlay and get several errors (version is Piwik 1.10b2)

{{{
Unsafe JavaScript attempt to access frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F from frame with URL http://geekmonkey.org/. Domains, protocols and ports must match.
 piwik.js:14
2
Unsafe JavaScript attempt to access frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F from frame with URL http://geekmonkey.org/. Domains, protocols and ports must match.
 piwik.js:14
Uncaught SyntaxError: Unexpected token < /index.php?module=API&method=Overlay.getTranslations&idSite=1&period=month&date=today&format=JSON&filter_limit=-1&jsoncallback=jQuery1830013447137549519539_1356954227925&_=1356954228294:2
Unsafe JavaScript attempt to access frame with URL http://geekmonkey.org/ from frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F. Domains, protocols and ports must match.
 chrome-extension://elifhakcjgalahccnjkneoccemfahfoa/chrome/contentscript.js:82
2
Unsafe JavaScript attempt to access frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F from frame with URL http://geekmonkey.org/. Domains, protocols and ports must match.
 piwik.js:14
2
Unsafe JavaScript attempt to access frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F from frame with URL http://geekmonkey.org/. Domains, protocols and ports must match.
 piwik.js:14
Uncaught SyntaxError: Unexpected token < /index.php?module=API&method=Overlay.getTranslations&idSite=1&period=month&date=today&format=JSON&filter_limit=-1&jsoncallback=jQuery18302361928941681981_1356954230577&_=1356954230734:2
19
Unsafe JavaScript attempt to access frame with URL http://geekmonkey.org/ from frame with URL http://piwik.geekproject.eu/index.php?module=Overlay&period=month&date=today&idSite=1#l=http$3A$2F$2Fgeekmonkey.org$2F. Domains, protocols and ports must match.
 chrome-extension://elifhakcjgalahccnjkneoccemfahfoa/chrome/contentscript.js:82

}}}

I noticed the "unexpected token <" error and looked what the server responds:

{{{

<div style='word-wrap: break-word; border: 3px solid red; padding:4px; width:70%; background-color:#FFFF96;'>
	    <strong>There is an error. Please report the message (Piwik 1.10-b2)
	    and full backtrace in the <a href='?module=Proxy&action=redirect&url=http://forum.piwik.org' target='_blank'>Piwik forums</a> (please do a Search first as it might have been reported already!).<br /><br/>
	    Strict Notice:</strong> <i>Only variables should be passed by reference</i> in <b>/var/www/htdocs/piwik.c0demonkey.com/html/plugins/Overlay/API.php</b> on line <b>116</b>
<br /><br />Backtrace --&gt;<div style="font-family:Courier;font-size:10pt"><br />
#0  Piwik_ErrorHandler(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/plugins/Overlay/API.php:116]<br />
#1  Piwik_Overlay_API-&gt;authenticate(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/plugins/Overlay/API.php:36]<br />
#2  Piwik_Overlay_API-&gt;getTranslations(...) called at [:]<br />
#3  call_user_func_array(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/core/API/Proxy.php:190]<br />
#4  Piwik_API_Proxy-&gt;call(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/core/API/Request.php:128]<br />
#5  Piwik_API_Request-&gt;process(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/plugins/API/Controller.php:27]<br />
#6  Piwik_API_Controller-&gt;index(...) called at [:]<br />
#7  call_user_func_array(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/core/FrontController.php:138]<br />
#8  Piwik_FrontController-&gt;dispatch(...) called at [/var/www/htdocs/piwik.c0demonkey.com/html/index.php:53]</div><br />
 </pre></div><br />jQuery18307169822950381786_1356954297728([{"oneClick":"1 click","clicks":"%s clicks","clicksFromXLinks":"%1$s clicks from one of %2$s links","link":"Link"}])
}}}

The installation is a fresh install (no files changed) of Piwik 1.10b2. I am running Google Chrome 23, nginx, PHP 5.4.9. I can't reproduce this on the demo, so I am not sure if this is a local misconfiguration.