I also experienced this, but with the os x 10.0.0 version. I excecuted a prebind command, and I suspect this killed the PPTP. As I understand the 10.0.2 version executes this prebind funcion automatically after updating.. Not 100 % sure though.
When I use the software updater. It says it cann't connect to the internet. It just can't find my PTPP connection which is active already. Same for online helpfiles. How did u manage to get the software updater to work at all with PPTP-GUI 2.0?