I get that client mismatch quite often this year. I am not really sure what it means but I go through the steps to fix it. not sure why it keeps popping up.
I average close to a hundred of these each year. I've had a few so far this year. Most I don't know why. But I did find out if another Intuit product is doing something at the same time (like QB desktop) it's a larger percentage of the crashes.