Nuendo 6.5 and VariAudio Pitch&Warp crash!!!

Hello!

Does anybody here have problem with VariAudio?? My Nuendo often crashes when using the VariAudio Pitch correction… Everything works ok, all of a sudden it starts to turn “windmill” and Nuendo closes (without any plugins running!!)
Where would be the problem?

I’m MAC user (Mac Pro 2008 8-core w. 10Gb RAM), OS X 10.9.5 Mavericks and Nuendo 6.5.35 (64-bit).

(If you tell me where I can find LOG file, I will send it to you.)

TNX for your help!