Thank you Rodney, I gave it a test with a large single frame render tiled into 400 tiles. At tile 182 of 400 it created a zero bite png and is displaying a an extra frame under "running", there are 2 grunts and it's displaying running as 3, as though a ghost grunt. In the Job Details it only says Running, but continuing to render later frames. Not sure how to force it to restart that particular tile. I tried restarting, deleting the frame png, but it's stuck. It's a 5 day render and currently on...