My delete key stopped working as well. I switch my lens from 'none' to anything else and it works. Ended up editing the Advanced lens and saving it as a custom. Also, my insert 'Mark' button on my Alphatrack has stopped working as well. Can't find a fix for that one. Argh... Work flow has been disrupted.
PS: I'm running Windows 7 64bit, so this is not just a Windows 10 issue.
Edit: Looks like the Insert Mark issue is being addressed. Been so busy I haven't had to read the forums. :-)