I had the same problems TWF BUT FIXED Now I guess that's why I bought 2 different ones and put solo to restHi Dave, it sounds like this only started after adding the light? If you remove the light and the Solo starts up, it is likely some sort of interference the light may be causing. It seems the 2.4 FW has changed the calibration system and many are seeing messages they haven't seen before. Try it without the light to see.