Sharing to local drive

I have had the same problem. I used Rush to create short and one song type videos and it works well for that. When I created a video with about 50 photos and 7 songs, it starts to render and then freezes and I can't even shut down the program. I have to click on the X in the corner several times until windows' shut down message displays. Also there seems to be no way to turn the Sync off. And there seems to be no intructions anywhere that explain how to turn the sync on and off. I read in Adobe that stated Rush was made to create large movies or large videos but that has not been my experience so far. Is there a fix for this?