I began having this problem on 10/21. It might have been following a Windows update, but I'm not 100% sure. Upon attempting to launch Quicken, I heard the normal opening tones and the app began its loading. Menu screen briefly appears but then immediately crashes. The bug error report then comes up asking me to report the error with my email address and any notes.
I called Support yesterday. Got me back up and running by reloading the app and launching a previously saved file. This seemed to work fine. I was able to perform a one step update and got all of my data up to date.
Later today, I re-established links with Fidelity and Merrill Lynch. The App reported that I needed to do this due to a change in how these companies connected with Quicken. Again, all seemed to be working fine. Performed several one step updates without issue.
Then, later this afternoon, I clicked into the app to hit the home screen, and another crash occurred. I'm back to the drawing board. Every time I attempt to launch the app, it crashes immediately. I'm told by Support that this situation has been reported by other users. I'm still on the phone with Support now.