I noticed a CCS6 beta 3 (v6.0.0.00116) has installed the ARM compiler into a ccsv6\tools\compiler\TMS470_5.1.2 directory. Not that it appears to be causing a problem, but back in CCS 5.3 wasn't the ARM compiler changed to be installed in a tools\compiler\ARM_<version> rather than tools\compiler\TMS470_<version> directory?
[Not sure if there are any scripts which expect ARM .vs. TMS470 in the directory name]