The problem with the installation of the module/theme, if you install APC + cacherouter.

if create settings in settings.php:

$conf['cache_inc'] = './sites/all/modules/cacherouter/cacherouter.inc';
$conf['cacherouter'] = array(
  'default' => array(
  'engine' => 'apc',               // apc, memcache, db, file, eacc or xcache
  'server' => array(),             // memcached (host:port, e..g, 'localhost:11211')
  'shared' => TRUE,                // memcached shared single process
  'prefix' => '',                  // cache key prefix (for multiple sites)
  'path' => 'files/filecache',     // file engine cache location
  'static' => FALSE,               // static array cache (advanced)
  ),
);

not installed

And if you remove this settings(apc enabled) installed modules