In LR once you add a keyword, have that thunbnail highlighted and (if on a Mac) hit the Command Key + the S key and it will send the info so it will be readable in Bridge. Or go to Metadata and click to send metadata to file. (I don't know the shortcut for a PC) I haven't done it with PSCC yet, but in CS6 I quite often had to close out Bridge and re-start it and the keywords showed up.
Sue