Flip & Reveal 3D - image trails when I render

I’m using FXTiles on Final Cut 6.0.6. When I put this effect over a transition and scrub through it before rendering it looks OK - but when I render it out, the outgoing image can be seen a series of freezes in the background like some kind of image buffer before the incoming image covers it. Thoughts?

I attached an image - don’t know that you’ll be able to tell what’s happening from it.

Can you please get in touch with FXFactory support. In the FXFactory app, please select Help (in the Menu) and then > Contact technical Support.