Can't Preview CAM Files

Hello,

Using PADS Layout 9.5, I can no longer preview any CAM documents. When i click 'Preview', nothing happens. There's a quick message at the bottom of the PADS window that looks like it says 'scanning database...' but once that goes away, nothing comes up. I updated to 9.5.1 and have the same problem. Prior to a couple weeks ago, I could CAM preview fine. Is there a setting or possible missing file that is causing this error?

Thanks