with the latest build IR restarts itself every time you hover over the command panel you don't have to change any settings now, which makes it unusable. I had selected physical camera with corona camera modifier on top I didn't try with no/other selection. trying DR now.
confirmed that IR restarts no matter what you do in the modify panel: select box, it restarts, change a spinner on the not yet placed box, it restarts, you don't have to add the box to restart the IR.