DVDFab MKV video skips

I have been using DVDFAB for quite a while now, Ver 5 and 6. Up until now, I have had no problems creating MKV’s. But recently with versions 6.2.0, 6.2.2 and now 6.4.0 the video skips. The audio seems fine, so when the video skips, the audio then becomes out of sync. Have tried going back versions but now makes no difference.

Can anyone suggest any fixes.

I have also read that this used to be a problem in the early versions.:frowning: