>> At first, produce crash dump and make it available for analisys.
>> And, of course, ensure you really have all attachments closed when
>> application is terminated.
>
> On debugging i noticed the problem be caued by Multithreading lib of
> MinGW build.
>
> Is it possible to compile with mingw and pthreads?

The short answer : i don't know.

The middle size answer : i even don't want to know

The final answer : on Windows use MSVC, all other options is not supported by project.

Hope this helps ;)

Regards,
Vlad