I appreciate you for getting back to us, DRAccounting.
First off, let your client configure their printing setup. It is to determine what causes the system to print a blank check.
Let them make sure that their printer and the checks are compatible. Then, try printing a sample check.
If the same thing happens, let them contact our Phone Support agents to have this investigated.
Lastly, let your clients use the pre-printed checks. This way, the memo will be included when printing the checks.
I've added this article for more information: Print a check in QuickBooks Online.
I'll be around if there's anything that I can help. Keep safe!
