Yes this solution is just a workaround.
When you install Cubase there is a little box in the lower right corner of the installer that you need to tick if you want it available for all users. I think the same happens with the Zero Gravity and Padshop Pro install wizard.
When I reinstalled Cubase some time back I decided to set it for all users, both Cubase and Zero Gravity/Padshop Pro. It now works as it should. Previously I had Cubase only for current used and Zero Gravity/Padshop for all users but that didn’t do the trick, it also needed Cubase to be like this.