Mq translate bug

Hi, my mq translate instalation brokes general wordpress language seetings.
If I have the plugin active, when I visit:
Wordpress < general settings < language
Then I set a language, click save. When page returns it still in the same language. Don’t change. And for this reason the system don’t load correct languages .mo files.

When I deactivate MqTranslate plugin. Then I go to general settings and language is ok. The system has saved the changes but MqTranslate block this settings when is active.

Please, any knows how to solve that?

Thanks in advance,
Ula