CCSv5.5 has a system analyzer bug if you only install C28x or MSP430 or C5000 alone. The system analyzer (RTOS Analyzer) is not installed properly with "single" architectures mentioned. There is a patch for this - or you can install C6000 or Tiva-C alongside your single architecture and that will fix it too. CCSv6 apparently has this bug fix...
Here is a post on the problem:
http://e2e.ti.com/support/development_tools/code_composer_studio/f/81/p/326142/1136302.aspx#1136302