I completely removed piwik, and checked out the svn. The initial configuring of piwik went just fine, and reported success. On the screen where I was presented with a place to log in (the url reads index.php?action=&module=&deleteTables=1) there is an error message that repeats 13 times:

```

Notice: Object of class Zend_Config could not be converted to int in /var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php on line 186

Backtrace —>

1. Piwik_ErrorHandler(8, Object of class Zend_Config could not be converted to int, /var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php, 186, Array ([name] => PluginsInstalled,[value] => Array (<sup>0</sup> => Login,<sup>1</sup> => CoreAdminHome,<sup>2</sup> => UsersManager,<sup>3</sup> => SitesManager,<sup>4</sup> => Installation,<sup>5</sup> => CoreUpdater,<sup>6</sup> => CorePluginsAdmin))) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php:186]
2. Piwik_Config→__set(PluginsInstalled, Array (<sup>0</sup> => Login,<sup>1</sup> => CoreAdminHome,<sup>2</sup> => UsersManager,<sup>3</sup> => SitesManager,<sup>4</sup> => Installation,<sup>5</sup> => CoreUpdater,<sup>6</sup> => CorePluginsAdmin)) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/PluginsManager.php:444]
3. Piwik_PluginsManager→installPluginIfNecessary(Piwik_CorePluginsAdmin Object ()) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/PluginsManager.php:110]
4. Piwik_PluginsManager→installLoadedPlugins() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php:245]
5. Piwik_FrontController→init() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/index.php:50]
   ```

Then there is the same error with a longer backtrace:

```
Notice: Object of class Zend_Config could not be converted to int in /var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php on line 186

Backtrace —>

1. Piwik_ErrorHandler(8, Object of class Zend_Config could not be converted to int, /var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php, 186, Array ([name] => PluginsInstalled,[value] => Array (<sup>0</sup> => Login,<sup>1</sup> => CoreAdminHome,<sup>2</sup> => UsersManager,<sup>3</sup> => SitesManager,<sup>4</sup> => Installation,<sup>5</sup> => VisitorInterest))) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/Config.php:186]
2. Piwik_Config→__set(PluginsInstalled, Array (<sup>0</sup> => Login,<sup>1</sup> => CoreAdminHome,<sup>2</sup> => UsersManager,<sup>3</sup> => SitesManager,<sup>4</sup> => Installation,<sup>5</sup> => VisitorInterest)) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/PluginsManager.php:444]
3. Piwik_PluginsManager→installPluginIfNecessary(Piwik_VisitorInterest Object ([] => Array (<sup>0</sup> => Array (<sup>0</sup> => 0,<sup>1</sup> => 0.5),<sup>1</sup> => Array (<sup>0</sup> => 0.5,<sup>1</sup> => 1),<sup>2</sup> => Array (<sup>0</sup> => 1,<sup>1</sup> => 2),<sup>3</sup> => Array (<sup>0</sup> => 2,<sup>1</sup> => 4),<sup>4</sup> => Array (<sup>0</sup> => 4,<sup>1</sup> => 6),<sup>5</sup> => Array (<sup>0</sup> => 6,<sup>1</sup> => 8),<sup>6</sup> => Array (<sup>0</sup> => 8,<sup>1</sup> => 11),<sup>7</sup> => Array (<sup>0</sup> => 11,<sup>1</sup> => 15),<sup>8</sup> => Array (<sup>0</sup> => 15)),[] => Array (<sup>0</sup> => Array (<sup>0</sup> => 1,<sup>1</sup> => 1),<sup>1</sup> => Array (<sup>0</sup> => 2,<sup>1</sup> => 2),<sup>2</sup> => Array (<sup>0</sup> => 3,<sup>1</sup> => 3),<sup>3</sup> => Array (<sup>0</sup> => 4,<sup>1</sup> => 4),<sup>4</sup> => Array (<sup>0</sup> => 5,<sup>1</sup> => 5),<sup>5</sup> => Array (<sup>0</sup> => 6,<sup>1</sup> => 7),<sup>6</sup> => Array (<sup>0</sup> => 8,<sup>1</sup> => 10),<sup>7</sup> => Array (<sup>0</sup> => 11,<sup>1</sup> => 14),<sup>8</sup> => Array (<sup>0</sup> => 15,<sup>1</sup> => 20),<sup>9</sup> => Array (<sup>0</sup> => 20)))) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/PluginsManager.php:110]
4. Piwik_PluginsManager→installLoadedPlugins() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php:245]
5. Piwik_FrontController→init() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/index.php:50]
   ```

Then more of the first type, and then a few errors about headers already being sent:

```
Warning: Cannot modify header information – headers already sent by (output started at /var/www/vhosts/ammonow.com/httpdocs/stats/libs/Zend/Log/Writer/Stream.php:95) in /var/www/vhosts/ammonow.com/httpdocs/stats/core/View.php on line 109

Backtrace —>

1. Piwik_ErrorHandler(2, Cannot modify header information – headers already sent by (output started at /var/www/vhosts/ammonow.com/httpdocs/stats/libs/Zend/Log/Writer/Stream.php:95), /var/www/vhosts/ammonow.com/httpdocs/stats/core/View.php, 109, Array ([e] => Exception Object ([] => The plugin ’’ has not been loaded.,[] => ,[] => 0,[] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/PluginsManager.php,[] => 209,[] => Array (<sup>0</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/Piwik.php,[line] => 722,[function] => getLoadedPlugin,[class] => Piwik_PluginsManager,[type] => →,[args] => Array (<sup>0</sup> => )),<sup>1</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/View.php,[line] => 79,[function] => getCurrentPlugin,[class] => Piwik,[type] => ::,[args] => Array ()),<sup>2</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/plugins/Login/Controller.php,[line] => 53,[function] => render,[class] => Piwik_View,[type] => →,[args] => Array ()),<sup>3</sup> => Array ([function] => login,[class] => Piwik_Login_Controller,[type] => →,[args] => Array ()),<sup>4</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php,[line] => 147,[function] => call_user_func_array,[args] => Array (<sup>0</sup> => Array (<sup>0</sup> => Piwik_Login_Controller Object ([] => Login,[] => 2009-03-01,[] => Piwik_Date Object ([] => 1235883600)),<sup>1</sup> => login),<sup>1</sup> => Array ())),<sup>5</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/Controller.php,[line] => 285,[function] => dispatch,[class] => Piwik_FrontController,[type] => →,[args] => Array (<sup>0</sup> => Login,<sup>1</sup> => )),<sup>6</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/plugins/CoreHome/Controller.php,[line] => 34,[function] => redirectToIndex,[class] => Piwik_Controller,[type] => →,[args] => Array (<sup>0</sup> => CoreHome,<sup>1</sup> => index)),<sup>7</sup> => Array ([function] => redirectToIndex,[class] => Piwik_CoreHome_Controller,[type] => →,[args] => Array ()),<sup>8</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php,[line] => 147,[function] => call_user_func_array,[args] => Array (<sup>0</sup> => Array (<sup>0</sup> => Piwik_CoreHome_Controller Object ([] => CoreHome,[] => 2009-03-01,[] => Piwik_Date Object ([] => 1235883600)),<sup>1</sup> => redirectToIndex),<sup>1</sup> => Array ())),<sup>9</sup> => Array ([file] => /var/www/vhosts/ammonow.com/httpdocs/stats/index.php,[line] => 51,[function] => dispatch,[class] => Piwik_FrontController,[type] => →,[args] => Array ())))))
2. header(Content-Type: text/html; charset=utf-8) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/View.php:109]
3. Piwik_View→render() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/plugins/Login/Controller.php:53]
4. Piwik_Login_Controller→login()
5. call_user_func_array(Array (<sup>0</sup> => Piwik_Login_Controller Object ([] => Login,[] => 2009-03-01,[] => Piwik_Date Object ([] => 1235883600)),<sup>1</sup> => login), Array ()) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php:147]
6. Piwik_FrontController→dispatch(Login, ) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/Controller.php:285]
7. Piwik_Controller→redirectToIndex(CoreHome, index) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/plugins/CoreHome/Controller.php:34]
8. Piwik_CoreHome_Controller→redirectToIndex()
9. call_user_func_array(Array (<sup>0</sup> => Piwik_CoreHome_Controller Object ([] => CoreHome,[] => 2009-03-01,[] => Piwik_Date Object ([] => 1235883600)),<sup>1</sup> => redirectToIndex), Array ()) called at [/var/www/vhosts/ammonow.com/httpdocs/stats/core/FrontController.php:147]
10. Piwik_FrontController→dispatch() called at [/var/www/vhosts/ammonow.com/httpdocs/stats/index.php:51]
    ```

I do get the login box at the bottom of those error messages. When I try to log in, I get only those same error messages.

-sh-3.2$ php —version
PHP 5.1.6 (cli) (built: Jul 16 2008 19:53:00)
Copyright © 1997-2006 The PHP Group
Zend Engine v2.1.0, Copyright © 1998-2006 Zend Technologies

Php is reasonably up to date, but I’ve never had any experience with this Zend engine, and I notice “Zend” in the error. I’m hesitant to try to upgrade this Zend, since this is on a managed server, but will try if you think it could help. I run piwik 2.28 on another project, but on the same server, with no issues.

Commenting out the offending if statement in Config.php makes everything happy:

1. if($this→userConfig→$name != $value)
2. {
3. $this→configFileUpdated = true;
4. }

I hope this information helps, and I am more than happy to try out fixes or give more information. Thanks!