Mask Crop Effect Working in Preview, but Not Rendering

Machine: iMac

Version: Premiere Pro CC 2014 - Updated this morning (1.27.15)

Editing an interview where the camera operator shows up in a reflection.  To fix this, I grabbed an earlier shot without the camera person in that spot, looped the frames, placed it on a layer below the main footage, and cropped using a mask to let the looped footage show through (hiding the camera operator).

This looks fine in the preview, but when I render the footage, the person is there again, as if the crop mask just went away.  I can't seem to correct this.

Please help!

Thanks.