Sometimes a pop-up blocker may prevent you from printing a check. You'll need to disable it since many of the tasks, such as printing, are performed in multiple windows.
You can follow the detailed steps in this article to turn off the pop-up blocker: Why doesn't anything happen when I select a button or link?.
If the problem persists, then let's try printing a check through an incognito window. This will help us determine whether it is caused by a browser's cache.
To open a private browser, refer to these shortcut keys:
Then, go back to your regular browser and clear the cache if it works.
If you're using the QuickBooks Online (QBO) Windows App, I suggest reaching out to our Support Team. This has been escalated to our product engineers and they have started their investigation to implement a permanent fix.
Here's how to reach them:
I'll notify you on this thread once this has been fixed.
Please let me know if you have any follow-ups or other questions. I'm here to help. Take care and have a good one.