My problem sounds similar, but happened overnight. The SA was working fine one day but wouldn’t start the next. The status bar at the top says “RSP-SAS Spectrum Analyzer not responding” shortly after I click the Start button. No other notices appear. If I close the application and bring up SDRuno (V1.40.2), everything works fine. System details are as follows: SDR- RSP-1A; OS- Windows10 Ver 2004, Cumulative update 2020-12 (KB4592438) installed 12/26/2020; SA software- RSP Spectrum Analyzer V1.1 installed 12/27/2020; failure noted- 1/3/2021; PC- Microsoft Surface Laptop (1st version). Both the PC and the SDR antenna are left unplugged when not in use. No other external devices are connected. I had run the SA on 2-3 different days without noticing a problem before this problem occurred. Since then nothing I have tried has made any difference. I’m looking forward to adding a tracking generator next, but I can’t find my way past this roadblock. Any help would be greatly appreciated. Thanks!