JPSC can you post your console.log for the purposes of me seeing exactly what add-ons you've got installed?
On my lengthy travels of getting RTB to even work at all on Mac (arguably it still doesn't in some cases) it appears as though there's some engine limit in OSX for net objects which totally forgets up once you go beyond it. A default install of RTB4 + BL will *just* work - if you happen to have any other add-on that uses net objects (even for a simple purpose, like VCE downloads it's manual using a net object) then everything blows the forget up and nothing works.