Hold the phone, I may have jumped the gun on this. This looks like it might be an issue with the VCReflect plugin from the folks at Video Copilot. If somones else would like to give it a try that would be swell. Here's what I did to create it.
Added a text layer.
Applied VCReflect and set it up
Moved text off screen.
As soon as the text is almost off screen it stops moving any further. At that point I start getting the Ram Preview error. If I delete the off screen keyframe I am back to normal.