If this happens, it's due to a corrupted '.Theater' folder. If you manually connect the Playon!HD 2 to your PC with the USB-slave (blue) cable, and delete this folder. You should be able to use r.5440 or r6629.
Note: If you have any USB-sticks or USB-hdd's plugged in, this '.Theater' folder can also be present in these drives, so a delete of this folder might be necessary here as well.
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