Some info for linux (ubuntu) users
I'm just installed CCSv6 beta version 6.0.0.00156 and the error "MSP430: Error initializing emulator: No USB FET was found" is still present on linux with a launchpad connected (ez430-rf2500 device).
As a workaround I'm using mspdebug http://mspdebug.sourceforge.net/ to flash the launchpad:
> mspdebug rf2500 "prog <elf_file_from_ccs>"
Attilio