Cb 6 crash when exporting audio mixdown

I’m receiving lately very strange issue with Cubase. When I open Export Audio Mixdown and I want to set new name (in Name bar) and new location (in Path bar) Cubase sometimes crash.
It actually happens when I’m opening Path, right clicking on opened window to create new folder. In that moment Cubase crash. Than I have to restart the computer. Other wise Cubase won’t let the sound card driver to load – it is saying that is already running.
It is not happening every time I’m going trough that procedure. But it is happening often.
Any idea guys?