Hi @CarriesMac , this sounds like there is a window possibly off-screen that's blocking you. When you're stuck like this, if you click any of the menu items at the top of the screen are they all greyed out as well? If they are try this to close any stuck open windows:
1. if QuickBooks is already open and stuck, hold the CTRL key and click on QuickBooks in the Dock
2. in the menu that opens up, now hold the Option key and chose to Force Quit, this will close QuickBooks
3. once it's closed, now hold the Command key and double click to open up QuickBooks (keep the key held down until you are back in your company file), this will open up your company file with all open windows closed
4. now, go back to Banking and select Reconcile, hopefully this will open up like it used to for you to the Account selection window
