Camtasia 2020 can not work nicely with Blender (including older versions). Using Blender with GPU and Camtasia 2020 either in software only mode or using video card GPU, both will crash recorder after a few seconds in Blender even just sitting there doing nothing. Completely useless situation. Only way I have got this to work is to start Camtasia, start recording screen, then launch Blender, then switch Blender to Cycles to use GPU and then Camtasia recorder will not fail. However, after recording is finished, back to Camtasia but timeline won't play until Blender is completely closed down. Unuseable.