Buildbox 3 was working on my device. But for 2 days it's not even launching. Sometimes it shows the loading page but doesn't open...
Try the basic stuff like uninstalling it. Right click and run as admin too. Perhaps disable anti virus and re install and try.
Other user as in a diff windows account on same machine? If so, sound like some permissions aren't setup or something inst installed on your account. I always just format and start fresh.
Try and delete the com.eightcell.buildbox folder from your c drive (windows) or from the applications library (Mac) to see if that fixes it. When you then open a new instance of buildbox it should then open and start downloading all of the modules
sound like some permissions aren't setup or something inst installed on your account. Tutuapp 9Apps Showbox