After installing the latest Windows 10 Pro update [April 12, 2016 — KB3147458 OS Build 10586.218] Camtasia 7 started working with no problems. The main problem with Camtasia 7 with Windows 10 (at least in here) has been that it hasn't been able to finish rendering projects - for some reason it stops in the middle. But now it works and it renders without a problem. Also, on some of my recordings, when I edit them in the Camtasia 7, the screen goes blank for some reason. I can see the mouse pointer, but everything else is black. But after the Windows update, that doesn't seem to happen anymore either. I don't know what Microsoft has done, but thumbs up nonetheless.