[musicman691]

Lookup 'track preset hack' here and it'll show how to create the chains on an empty track and how/where to save it. When done right you can see it in the 'create new track' dialog box. As to the error you're seeing have you repaired permissions? That is assuming you're on some form of OSX - your profile page doesn't say which one you're running.

Possibly related, possibly not but what's your system drive in that iMac? It's not a Fusion drive is it? Those are death to PT.