Don't recall this ever happening before in 35 years of using Quicken.
On starting Quicken I installed the 59.10 update.
Started a One Step Update which includes about 5 bank accounts, 4 cc accounts, and 7 investment accounts.
The only thing I did that I typically don't do was click and drag the OSU dialog on its title bar to try to move it a bit to the right so I could see underneath. It didn't move, seemed stuck in place.
It looked like the banking and cc accounts were done, but I think it was still doing the final securities updates.
About 2 seconds later Quicken just disappeared. No error message from the application or Windows. No process running in task mgr. Just gone.
I started Quicken again. It started normally. I reconciled all the banking/cc downloads and that looked fine. The closing prices hadn't been updated for today.
I ran OSU again and it completed fine and updated the prices.
Weird.
Quicken Classic Business & Personal