Let's run some steps to isolate why the system shows a blank screen, userpdraper101.
There are instances that an issue like this occurs when the system encounters browser-related issues. To start with, let's open QuickBooks on a private window. It is the best place to identify browser-related issues.
You can use these keyboard shortcuts to open one depends on your browser:
Google Chrome: Ctrl + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Microsoft Edge: Ctrl + Shift + P
Safari: Command + Shift + N
If it works, you can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected issues on the system.
You can also switch to a different supported-browser like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.
I've also added these references for more information about Open Banking: