Hi there, BFLLC.

Thanks for joining this conversation.

Currently, the investigation is still in progress. Our product engineers are diligently working to resolve the issue with writing checks in QuickBooks Desktop (QBDT) at the earliest opportunity.

As you have already contacted our Support team, you have now been added to our notification list. This will assist our engineers in evaluating the extent of the impact on users.

For now, you can try entering the details on the bottom table first before entering the payee and amount of the check as a workaround.

I'm also adding this article that tackles managing checks in QBDT for future reference: Create, modify, and print checks.

Please let me know if you have additional questions about this or anything else. I'm more than willing to assist. Take care.