Any error message?
Did you do an inplace upgrade from an earlier version of OSX?
Yes, and ID ran fine until the latest update to Mac OS.
As ID loads it hangs up at the step "Starting up Service Registry"
Try trashing your prefs, but again, did you do an inplace upgrade of an earlier version OSX? If so, that is a crapshoot and a ticking time bomb that could go off any time.
I again trashed my preferences upon starting ID, but it still hangs up on the step "Starting up Service Registry." Yes, I did upgrade "in place" an earlier version of OS X 10.10 to 10.10.4 and that's when the problem with ID began. Interestingly, other apps within CS 6 still seem OK.
I'll try going to the local Apple Store and have the geniuses perform a clean re-install of my OS and see if that helps. Do you happen to know if other Mac CS 6 users are having a similar problem with ID?
If they did in place upgrades, many users are having issues. I never do them because of this.
A clean install takes a bit longer but any issues that need troubleshooting will more than kill off the time savings.
Don’t forget to deactivate CS6 before the clean install.
BTW, it’s a very easy procedure. Check out this article: http://mashable.com/2014/10/17/clean-install-os-x-yosemite/