I've run into this on one of my Mac Pros (model 1,1) running 10.7.5 - my "Gatekeeper" settings are also set to “Anyone,” and I, too, have tried a deep clean install: I removed MVC and all it's related files using AppCleaner, then I performed a deep cache cleaning using Lion Cache Cleaner, before reinstalling.
I do NOT have this issue on my MacBook Pro 5,2 also running 10.7.5.
I'm sorry – I don't know where to begin to look in the Console logs; if you'll tell me where to look, I could provide you with more information.
I, too, will also try to re-download the v.3.0 file from your site, and will try a reinstall. (Or am I misunderstanding how the thread on this page works?)
P.S. Do you automatically assign ticket numbers, or how does that procedure transpire?
BTW - this topic is 10 months old - was a solution ever found for this problem? I don't see any signs of it being resolved…
Hello? Anybody out there (in here?)?