Cubase artist 10.5.30 jammed after export audiomixdown

Cubase artist10.5.30 jammed after export audio mixdown. The program can only be closed by using control alt delete
It’s possible open cubase artist 10.5.30 again and activate a song, but when I want to play it I don’t hear any sound and playback stops at measure 18, where an audio file starts.
Can someone help me