Assuming the various folders exist, the following sequence correctly opens a new lister with a C:\Temp\1 tab and then correctly add a C:\Temp\2 tab, but a tab for C:\Temp\3 is added to the original lister rather than the new lister.
Go "C:\Temp\1" NEW
[
Go "C:\Temp\2" NEWTAB
Go "C:\Temp\3" NEWTAB
]
Regards, AB