Do you have any other USB devices plugged in other than your SL2?
If so, unplug them and make sure you are plugging the Dicers and the SL2 into the two USB ports directly on your computer.. not into a USB hub.
If you aren't using any other USB devices and do have both devices plugged into the available ports on your computer I would try reverting your version of Scratch Live.
You can find all older versions here -->
serato.com