bug
page /modules/boonex/forum/integrations/base/config.php - row 88

if ($gConf['lang'] && file_exists($path . 'layout/base_' . $gConf['lang']))
{
complile lang - ru

error

Warning: require_once(/***/html/community/modules/boonex/forum/layout/uni_ru/params.php) [function.require-once]: failed to open stream: No such file or directory in /***/html/community/modules/boonex/forum/integrations/base/config.php on line 99

resolve probleme

if ($gConf['lang'] && file_exists($path see more . 'layout/base_' . $gConf['lang']))
{

replace

if ($gConf['lang'] && file_exists($path . 'layout/base_' . $gConf['lang']) && file_exists($path . 'layout/uni_' . $gConf['lang']))
{