Waterfall blank and multi-channel decode empty #fldigi

Doug N4AHO

Was running fine yesterday. I looked up and the waterfall was just a black hole. I was still getting multi-freq traffic showing on the left side. Now, that is gone too. I can call out and copy replies but I can't see anything off my exact frequency. Tried WinWarbler as a check; it works perfectly. What could have gone wrong by itself. Using FLDigi 4.1.20 on Win10.