Cubase 9 Audio/Video Sync

My Config:
Mac Pro early 2009
Processor: 2x 3,33 GHz 6-Core Intel Xeon
Memory 32 Go 1333 Mhz DDR3 ECC
GPU: AMD Radeon R9 280X 3072Mo
OS: OS X El Capitan 10.11.6

My problem: Since i installed CUBASE 9 I cannot import video file. It’s crashing evrytime.
I made some search and a lot of people have the same issue. The only solution until Steinberg give us a patch to fix it is to use a video playback software. I try many. Finally i choose Horae who is working quite correctly.
I have just a problem of sync. The video play in Horae is a little bit unsynchronised with audio from Cubase.
If someone can help me it will be very very great…