Mixdown Locator Error

I’m experiencing a strange error when mixing down. The mix is ending just a bit earlier (2 bars give or take) of where I place the right locator. The left locator start point is fine. I’ve tried multiple times, and in multiple projects, and rebooted, all with the same result of chopping of the end of the mix earlier than it should. I’ve been using Cubase since version 2 and this has never happened. This happens when mixing down in real time mode too. I’m using Cubase 8.0.3 on a Mac with Maverick. This is my livelihood and I’ve got deadlines so any help would be much appreciated! Thanks much.