Could be a networking problem. I've uncommented the interfaces.d/ directory from the interfaces config. Same issue occurs either way.
At first whonixsetup says tor was started sucessfully, then it goes into a whonixcheck, which gives an error saying Tor is not running, and that the tor.pid file does not exist.
I've tried doing service tor restart then whonixcheck, same issue.
tor@default status is failure, and mentions tor default config file. Maybe therein lies the problem?