Hi AartiG,
Thank you very much. This was indeed my problem.
Updating to 5.5 has presented another problem, which might be better in a separate thread, but here goes. When updating through the IDE (I believe it was "Help -> Look for Updates" or similar) I didn't see any errors reported during installation, but when I next open ccsv5 i get the error "The Ccstudio executable launcher was unable to locate its companion launcher jar.".
I understand from a few threads that the only way to resolve this is not to update through the IDE, but to download s fresh copy and install that way. Is this the case?
Cheers,
Sam