m_m
16
Should I clean the build every time I switch to compile the different Gen3 devices?
yes. workbench tries to detect a "dirty" state at launch and will prompt you to clean if necessary but in general we say "when in doubt, clean" 
What I’m seeing is that your folder path cannot have any whitespace or blank spaces or it will not work.
yes, an unfortunate limitation of our current build system - more info here: