I'm having the same problem with a perpetual freeze on the Register Quicken Window, under Crossover 12.1.1 and Q2013. Interesting to note that in the Register window, you can't use tab to move through the fields. I've tried everything including reinstalling Crossover 12.1.1.
This is really bad, because without registering quicken none of the online services, including billpay, are enabled.
FOLLOW-UP:
After posting the above, I tried uninstalling and reinstalling Quicken 2013. Went through the same process and the same apparent registration window freeze. HOWEVER, this time I waited a little longer before hitting the "finished" button on the Register page. It still looked like everything was frozen, but when I went to quit out of Quicken and got a message saying that there was a onestep update in process, and do I want to finish before quitting, I said "yes" and the update went through. I did have problems connecting to one of my banks (Citibank) but a second running of onestep update worked.