polylang (dev version) in multisite can't create new site after enabling plugin

wordpress fresh installation (with standard settings)
multisite (network) with subdirectories
no static home page
polylang 1.5.2.1 (dev version)
after network enabling plugin (no languages defined), can not create new site. process of creating new site ends with white screen (in browser). site does not exist – again white screen in browser when trying to open it. after deactivation of plugin, site exists, but there is no standard content, no left menu.

php 5.5.9-1ubuntu4.1

in database:
table wp_options
_transient_plugin_slugs

a:3:{i:0;s:19:"akismet/akismet.php";i:1;s:9:"hello.php";i:2;s:21:"polylang/polylang.php";}

polylang

a:11:{s:7:"browser";i:1;s:7:"rewrite";i:1;s:12:"hide_default";i:0;s:10:"force_lang";i:0;s:13:"redirect_lang";i:0;s:13:"media_support";i:1;s:4:"sync";a:0:{}s:10:"post_types";a:0:{}s:10:"taxonomies";a:0:{}s:7:"domains";a:0:{}s:7:"version";s:7:"1.5.2.1";}

table wp_sitemeta
_site_transient_update_plugins

O:8:"stdClass":4:{s:12:"last_checked";i:1403719576;s:7:"checked";a:3:{s:19:"akismet/akismet.php";s:5:"3.0.0";s:9:"hello.php";s:3:"1.6";s:21:"polylang/polylang.php";s:7:"1.5.2.1";}s:8:"response";a:0:{}s:12:"translations";a:1:{i:0;a:7:{s:4:"type";s:6:"plugin";s:4:"slug";s:7:"akismet";s:8:"language";s:5:"pl_PL";s:7:"version";s:3:"3.0";s:7:"updated";s:19:"2014-04-17 04:33:49";s:7:"package";s:65:"https://global.wordpress.org/builds/plugins/akismet/3.0/pl_PL.zip";s:10:"autoupdate";b:1;}}}

no other signs of polylang

https://wordpress.org/plugins/polylang/