Currently, there's an ongoing investigation about the QuickBooks Online mobile check deposit showing a black screen. Please know that this issue is being taken care of with utmost urgency. Our product engineering team is doing their best to find a permanent solution as soon as possible.
For now, I recommend contacting our Phone Support team so you'll be added to the list of affected users. This way, you'll be notified through email about the updates of the investigation. Here's how you can connect with them:
Go to the Help icon in the top right-hand corner.
Select Search, then press the Contact Us button.
Enter your question in the box and hit Continue.
Please choose the best way you'll want to reach out to us.
Make sure to check their support hours since they can only accommodate you Mondays to Fridays from 6 AM to 6 PM PT and Saturdays from 6 AM to 3 PM PT.