When using the SPACE + Command shortcut (Adobe style shortcuts) on Mac
Is the same shortcut as Spotlight Search in OSX. If you wish to access this key combination inside Toon Boom software you will need to change/disable the key combination for Spotlight. To do this, go to the Apple Icon - System Preferences - Stotlight; uncheck or change the shortcut at the bottom of the window.
If you hit or release the Command key first - the tool can get "stuck" as the hand tool preventing you from changing tools. To prevent this, make sure to hit and release the space key first. If your tool selection is already "stuck" on the hand tool, simply hit the space bar again to clear it up.
Mac OS X v10.9