It's better you contact techsupport at revisionfx.com
If you hit the support button at the top of our website and then the contact form, it will send you a way to ship to us a project to see.
I am unclear if you mean the whole screen (then memory issue?) or the viewer. If the viewer there might be an issue with the MV themselves. For example if there is no alpha channel in the MV it could throw pixels off the screen... Hard to say blindly.