carwiz said:
Any feedback from the Clean Boot?
OK, I got around to trying the Clean Boot. It had no effect on Quicken's flickery flashy startup. I even tried a "too-clean" boot and disabled Microsoft services as well as the 3rd party services. No joy there, either. But thanks for the eminently logical suggestion.

Any other thoughts? Someone elsewhere suggested that Quicken was improperly using hardware display acceleration, and that it would be better to disable that. But I don't know how to do that.